Sphere surface area - We get more details about the Microsoft Surface tablet, Apple announces a special event, Boxee releases a DVR, and Gmail expands its beta for new search features. We get more detai...

 
A cone is a pyramid with a circular base with radius r and height h. The side length s can be found using the Pythagorean Theorem. s2 = r2 + h2. or. s = √ ( r2 + h2 ) Surface Area of a Cone = πr2 + πrs. Volume of a Cone = 1⁄3( πr2h ) Surface area formulas and volume formulas often appear in homework problems. This is a list of …. Amazon com store card login

If you have ever attended (or tuned into) one of Monzo’s many community events, you are likely familiar with the work of Simon Balmain. An early employee of the challenger bank, he...Surface Area of Spheres with Proof. Drag the red point to see how a sphere can be dissected into n pyramids (approximate) of heights equal the radius r. Let A1, A2, ..., An be the base areas of the pyramids. (a) Show that 1/3 (A1+ A2 + ... + An) r ≈ Volume of the sphere (a) When n tends to infinity, show that 1/3 S r = V where V and S are the ...A sphere is a round-shaped object in three-dimensional space. All points on a sphere’s surface are the same distance from its center point. Some examples of a sphere are a globe, m...The hitch is that the width is not dr but is ds (see the figure). With a few calculus, you can find ds = R R2−r2√ dr → dA = 2πr R R2−r2√ dr. This is a method to find the area of the sphere. Of course, a simpler method consists in doing the job in spherical coordinates instead of Cartesian coordinates.2 Answers. The surface area of a sphere, or more precisely the zone, is 2πRh Proof: Let R denote the radius of the sphere, a and b denote the upper and lower radii as shown in your figure, and h denote the height of the segment. The surface is a surface of revolution about the z-axis: S(s) = ∫2πx√1 + x ′ 2dz Note that we're working in ...Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.A sphere is defined by three axes, x-axis, y-axis and z-axis. The region occupied by a circle is simply an area. The formula of the area is πr2. A sphere has a surface area covered by its outer surface, which is equal to 4πr2. It does not have any volume. A sphere is a geometrical shape in 3-dimensional space that is equidistant from a fixed point and does not have any vertex. In simple words, a sphere is a round shaped 3-dimensional figure. The fixed point is known as the center of the sphere. The fixed distance from the center to its surface is called the radius of that sphere.Surface area of sphere = 4 x \(π\) x 6 2 = 452.3893421 mm 2 Surface area of hemisphere = 452.389 ÷ 2 = 226.1946711 mm 2 Total surface area = base + curved surface + hemisphere = 113.0973355 ...Illustration of mathematical poster explaining sphere with formulas for volume and surface area + 4 wireframe models vector art, clipart and stock vectors.Formula for the surface area of sphere = 4πr 2 = 4×(22/7)×7 2 = 616. Surface area of a sphere is 616 cm 2 (ii) Radius (r) of sphere = 21/2 = 10.5 cm. Surface area of a sphere = 4πr 2 = 4×(22/7)×10.5 2 = 1386. Surface area of a sphere is 1386 cm 2. Therefore, the surface area of a sphere having a diameter 21 cm is 1386 cm 2 2 Sept 2018 ... Today, we derive the formula for the surface area of a sphere using integration.11 Dec 2018 ... Review how to find the surface area of sphere using 3.14 for pi.Surface Area. Surface area is a two-dimensional measurement that is the total area of all surfaces that bound a solid. The basic unit of area is the square unit. Surface Area of a Sphere: …Jan 18, 2024 · Learn how to find the area of a sphere using different formulas and parameters, such as radius, diameter, volume, and surface to volume ratio. Use this area of a sphere calculator to estimate or calculate the surface area of any sphere in various units, including SI and imperial. Sandblasting is a highly effective method for removing paint, rust, and other contaminants from surfaces. Whether you need to restore the appearance of your home or prepare a surfa...Example 1: surface area of a sphere given the radius. Find the surface area of the sphere below. Write your answer to 1 1 decimal place. Write down the formula. To answer the question we need to use the formula …Feb 18, 2024 · Example: Find the surface area of a sphere of radius 7 cm. Step 1: Note the radius of the given sphere. Here, the radius of the sphere is 47 cm. Step 2: We know that the surface area of a sphere = 4πr2. So, substitute the value of the given radius in the equation = 4 × (3.14) × (7)2 = 616 cm2. Surface Area of a Sphere. Sphere Surface Area baseball can model a sphere. To approximate its surface area, you can take apart its covering. Each of the two pieces suggests a pair of circles with radius r, which is approximately the radius of the ball. The area of the four circles, 4πr 2, suggests the surface area of the ball.Find the surface area and volume of composite figures such as cylinders and spheres or cones and spheres. Video – Lesson & Examples. 58 min. Introduction to spheres; 00:00:22 – How to find the volume and surface area of a sphere (Examples #1-3) Exclusive Content for Member’s Only ; 00:11:33 – Find the volume and surface area of …Given a sphere with a radius of 9cm, determine the surface area of that sphere. Step 1: Identify the radius. In this example, r = 9cm. Step 2: Plug our r value into the surface area formula -. S A ...surface area of the cube S2 = 6a2 =6V2/3 S 2 = 6 a 2 = 6 V 2 / 3. Comparing surface areas, S1 <S2 S 1 < S 2 i.e. the surface area of a sphere is smaller than that of a cube for a given volume. Similarly, we can analytically compare surface area of a sphere with that of any other geometrical shape. The minimum surface area of the …Video projection is popular both at home and at the office. For conference room presentations and home theater fun, high reflectivity projection screens provide best viewing result...The surface area of a sphere refers to the total area that covers its exterior. Imagine if you could peel an orange and lay its skin flat – the area of this skin represents the surface area of the sphere. The formula to calculate the surface area of a sphere is 4πr², where r represents the radius of the sphere.Aug 3, 2023 · The surface area of a sphere is the entire region covered by its outer round surface. It is also the curved surface area of a sphere. Like all other surface area it is expressed in square units such as m 2, cm 2, and mm 2. We will learn how to find the surface area of a solid sphere. The equations are given below. Formulas. The basic formula is ... surface area of the cube S2 = 6a2 =6V2/3 S 2 = 6 a 2 = 6 V 2 / 3. Comparing surface areas, S1 <S2 S 1 < S 2 i.e. the surface area of a sphere is smaller than that of a cube for a given volume. Similarly, we can analytically compare surface area of a sphere with that of any other geometrical shape. The minimum surface area of the …Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.Alright, let's look at the formulas for the volume and surface area of a sphere. Surface Area and Volume of a Sphere. For a sphere of radius r \hspace{0.2em} r \hspace{0.2em} r, the volume would be.Learn how to calculate the area and volume of a sphere using the formula 4πr², where r is the radius of the sphere. Find out the properties, steps and examples of finding the …Jan 30, 2024 · Surface area of a sphere: A = 4πr², where r stands for the radius of the sphere. Surface area of a cube: A = 6a², where a is the side length. Surface area of a cylinder: A = 2πr² + 2πrh, where r is the radius and h is the height of the cylinder. Surface area of a cone: A = πr² + πr√(r² + h²), where r is the radius and h is the ... The formula for the volume of a sphere is V = 4/3 π r³, where V = volume and r = radius. The radius of a sphere is half its diameter. So, to calculate the surface area of a sphere given the diameter of the sphere, you can first calculate the radius, then the volume. Created by Sal Khan and Monterey Institute for Technology and Education.The intersection of two spherical surfaces is a circle whose plane is perpendicular to the line joining the centers of the spheres and whose center is on that line. (See figure to the right.) A plane perpendicular to a radius at its extremity is tangent to the sphere. Formulas for a Sphere. Surface Area, A The surface area of a sphere is equal ...Determine the surface area and volume of this shape: The radius of a sphere is 4. Find its volume and total surface area. A sphere has a radius of 5. A right cylinder, having the same radius has the same volume. Find the height and total surface area of the cylinder. Sphere: volume = 296 cm 3. Find the Diameter. Sphere: surface area is 179 in 2.Increased Offer! Hilton No Annual Fee 70K + Free Night Cert Offer! On this week’s MtM Vegas we have so much to talk about including a new look at MSG Sphere and Circus Circus getti...The step by step workout for how to find what is the volume and surface area of a sphere. Students may use this sphere calculator to generate work with steps for any other similar input values. Workout : step 1 Address the formula, input parmaeters & values. Radius = 5 in. step 2 Apply radius values in Volume formula. Volume V = 4πr³ 3.The step by step workout for how to find what is the volume and surface area of a sphere. Students may use this sphere calculator to generate work with steps for any other similar input values. Workout : step 1 Address the formula, input parmaeters & values. Radius = 5 in. step 2 Apply radius values in Volume formula. Volume V = 4πr³ 3.Surface Area of a Sphere. ... Surface Area of a Cone. Click here for Questions and Answers. Practice Questions. Previous: Surface Area Videos. Next: Vectors Videos. GCSE Revision Cards. 5-a-day Workbooks. Primary Study Cards. Search.A sphere is a solid geometric figure defined as the set of all points equidistant from a common center point. It is perfectly symmetrical, and its surface is uniformly curved, with...Concrete stains can be used to give plain concrete a beautiful new look. Watch this video for tips on how to test and prepare concrete surfaces for staining. Expert Advice On Impro...Surface area of a sphere formula. The “surface area of the sphere” can be expressed as in mathematical form and it can be denoted as “SA = 4𝝅r2”. Where SA is referred to as Surface Area, and “r” is expressed as the radius of the sphere. The surface area of the sphere concept can be understood by a few mathematical examples.Volume and Surface Area. Volume of a Sphere. Surface Area of Sphere. Back to Solid Geometry. Math warehouse lessons on finding the volume and surface area of a sphere.Learn how to calculate the surface area of a sphere using the formula Area = 4 π r 2, where r is the radius of the sphere. See the derivation, examples and interactive …The formula for the volume of a sphere is V = 4/3 π r³, where V = volume and r = radius. The radius of a sphere is half its diameter. So, to calculate the surface area of a sphere given the diameter of the sphere, you can first calculate the radius, then the volume. Created by Sal Khan and Monterey Institute for Technology and Education.Summary: The area of the surface of a sphere = 4 π r 2 or π d 2 sq.units, where r is the radius and d is the diameter. The total surface area of the hemisphere = 3 π r 2 sq.units. Example: A solid is composed of a cylinder with hemisphere ends. If the whole length of the solid is 108cm and the diameter of the hemispherical ends is 36cm, find ...Surface to volume ratio: A / V = 3 / r . Below are a few formulas we use to obtain the surface area of a sphere: 1 . Specified radius: A = 4 * π * r² , 2. Specified diameter: A = π * d² , 3. Specified volume: A = ³√ (36 * π * V²) , 4. Specified surface to volume ratio: A = 36 * π / (A/V)² . Our area of a sphere calculator enables the ...The sphere has the smallest surface area of all surfaces that enclose a given volume, and it encloses the largest volume among all closed surfaces with a given surface area. The sphere therefore appears in nature: for example, bubbles and small water drops are roughly spherical because the surface tension locally minimizes surface area. Sep 17, 2020 · Table 6.5.2: Surface Area formulas; Geometric Figure . Surface Area Formula . Surface Area Meaning \(S A=2 B+P h\) Find the area of each face. Add up all areas. \(S A=B+\dfrac{1}{2} s P\) Find the area of each face. Add up all areas. \(S A=2 B+2 \pi r h\) Find the area of the base, times 2, then add the areas to the areas of the rectangle ... The surface area of a sphere refers to the total area covered by its curved outer surface. A sphere is a perfectly symmetrical three-dimensional geometric shape where all points on its surface are equidistant from its center. To calculate the surface area of a sphere, you can use the following formula: Surface Area = 4πr² … Sphere Surface ...Surface integrals of scalar fields. Assume that f is a scalar, vector, or tensor field defined on a surface S.To find an explicit formula for the surface integral of f over S, we need to parameterize S by defining a system of curvilinear coordinates on S, like the latitude and longitude on a sphere.Let such a parameterization be r(s, t), where (s, t) varies in some …The procedure to use the surface area of a sphere calculator is as follows: Step 1: Enter the radius value in the input field. Step 2: Now click the button “Solve” to get the sphere surface area. Step 3: Finally, the surface area of a …Summary: The area of the surface of a sphere = 4 π r 2 or π d 2 sq.units, where r is the radius and d is the diameter. The total surface area of the hemisphere = 3 π r 2 sq.units. Example: A solid is composed of a cylinder with hemisphere ends. If the whole length of the solid is 108cm and the diameter of the hemispherical ends is 36cm, find ...In this chapter we will discuss questions related to surface area of sphere with solution. The formula for surface area of sphere is given as; Surface Area = \mathtt{Surface\ area\ =\ 4.\pi .r^{2}} Where, r is the radius of sphere.The formula for the volume of a sphere is V = 4/3 π r³, where V = volume and r = radius. The radius of a sphere is half its diameter. So, to calculate the surface area of a sphere given the diameter of the sphere, you can first calculate the radius, then the volume. Created by Sal Khan and Monterey Institute for Technology and Education. Surface Area of a Sphere. ... Surface Area of a Cone. Click here for Questions and Answers. Practice Questions. Previous: Surface Area Videos. Next: Vectors Videos. GCSE Revision Cards. 5-a-day Workbooks. Primary Study Cards. Search.A sphere’s surface area is the total area that the sphere’s surface covers. It is measured in square units. A mathematical constant π has an approximate value of 3.14159. Key …A sphere’s surface area is the total area that the sphere’s surface covers. It is measured in square units. A mathematical constant π has an approximate value of 3.14159. Key Concepts. The surface area of a sphere does not depend on its orientation in space.The surface area of a sphere refers to the total area that covers its exterior. Imagine if you could peel an orange and lay its skin flat – the area of this skin represents the surface area of the sphere. The formula to calculate the surface area of a sphere is 4πr², where r represents the radius of the sphere.Lauren Hillier. $1.15. PDF. These posters/handouts are great for learning to find the surface area of 3D shapes. It includes cylinder, cone, sphere, cube, pyramid and rectangular prism.For each, it shows, a diagram of the shape, the formula and a worked example.Each has a colour and B&W copy in the download.The formula for the volume of a sphere is V = 4/3 π r³, where V = volume and r = radius. The radius of a sphere is half its diameter. So, to calculate the surface area of a sphere given the diameter of the sphere, you can first calculate the radius, then the volume. Created by Sal Khan and Monterey Institute for Technology and Education.Aug 3, 2023 · The surface area of a sphere is the entire region covered by its outer round surface. It is also the curved surface area of a sphere. Like all other surface area it is expressed in square units such as m 2, cm 2, and mm 2. We will learn how to find the surface area of a solid sphere. The equations are given below. Formulas. The basic formula is ... A hemisphere is one-half a sphere, its surface area including the circular cross section. Examples of 3D solid shapes. A prism is a 3D solid with two congruent, opposite faces (bases) with all other faces parallelograms of some sort. Examples of prisms are cubes and triangular, rectangular, hexagonal and octagonal prisms.The new title registry for crypto wallets set to signal a complete paradigm shift in how institutions see cryptoLOS ANGELES, CA / ACCESSWIRE / Aug... The new title registry for cry...Radius, r =14 cm. By the formula, Surface area of a sphere = 4πr 2. On substitution, we get, SA = 4 x 3.14 x 14 x 14. = 2,461.76 cm 2. Example 2. The diameter of a baseball is 18 cm. Find the surface area of the ball. Solution.If you have ever attended (or tuned into) one of Monzo’s many community events, you are likely familiar with the work of Simon Balmain. An early employee of the challenger bank, he...A sphere is a three-dimensional object that is round in shape and has a constant mean curvature. The surface area of a sphere is the total area covered by the surface of a …This is level 7; Find the surface area of a variety of spheres. The diagrams are not to scale. 1. Find the surface area of a sphere with a radius of 7cm. Give your answer to the nearest square centimetre. ☐ cm2 ☐. 2. Find the surface area of a sphere with a radius of 24cm.Sphere Surface Area. The area covered by the outer surface of the sphere is known as the surface area of a sphere. It is measured in square units. Hence, the formula to find the surface area of a sphere is: Surface Area of Sphere, S = 4πr 2. In terms of diameter, the surface area of a sphere is given as S = 4π(d/2) 2, where d isWhy Is the formula for surface area of sphere equal to 4pir^2? And applying its formula to find the surface area. Created by Devashish Phadnis.Solid Sphere is the region in space bound by a sphere. Examples on surface area and volume of sphere and hemisphere. Example -1: Find the surface area and volume of sphere having the radius 7 mm. Solution: Here radius of sphere = r = 7 mm. Now Surface area of a Sphere = 4 π r 2 = 4 x (22/7) x 7 x 7 = 616 mm 2. Volume of a …Enter the radius, diameter, surface area or volume of a Sphere to find the other three. The calculator shows the calculations in live mode and explains how to calculate the surface …The formula for the volume of a sphere is V = 4/3 π r³, where V = volume and r = radius. The radius of a sphere is half its diameter. So, to calculate the surface area of a sphere given the diameter of the sphere, you can first calculate the radius, then the volume. Created by Sal Khan and Monterey Institute for Technology and Education. 13 Jan 2018 ... Access our website http://www.athenescience.org for free resources on science activities. Resources are available in multiple Indian ...Calculate sphere surface area step by step. Equations. Inequalities. Scientific Calculator. Scientific Notation Arithmetics. Complex Numbers. Polar/Cartesian. Simultaneous Equations. System of Inequalities.Brooklyn College explains that cells are small because they must have a large surface area relative to the amount of volume they contain to function properly. As a sphere grows lar...13 Jan 2018 ... Access our website http://www.athenescience.org for free resources on science activities. Resources are available in multiple Indian ...The formula for the surface area of a sphere is more difficult to derive: because a sphere has nonzero Gaussian curvature, it cannot be flattened out. The formula for the surface area of a sphere was first obtained by Archimedes in his work On the Sphere and Cylinder. The formula is: A = 4πr 2 (sphere), where r is the radius of the sphere.Formula for volume of sphere. The general formula for calculating volume of the sphere is given as follows. Volume of sphere = 4 3 π r 3. In the above formula, the parameters π and r are used. These parameters have the following interpretations. π = 3.142. The value of the radius is half of the sphere diameter. For example,13 Jan 2018 ... Access our website http://www.athenescience.org for free resources on science activities. Resources are available in multiple Indian ...Surface Area of a Sphere. Sphere Surface Area baseball can model a sphere. To approximate its surface area, you can take apart its covering. Each of the two pieces suggests a pair of circles with radius r, which is approximately the radius of the ball. The area of the four circles, 4πr 2, suggests the surface area of the ball.It is measured in square units. Hence, the formula to find the surface area of a sphere is: Surface Area of Sphere, S = 4πr 2. In terms of diameter, the surface area of a sphere …Increased Offer! Hilton No Annual Fee 70K + Free Night Cert Offer! On this week’s MtM Vegas we have so much to talk about including a new look at MSG Sphere and Circus Circus getti...16 Jul 2020 ... Surface area of sphere , How to derive formula of surface area/ Maths Activity #MathsActivity #SurfaceAreaOfSphere #surfaceareaofshpere ...Sony's Xplod subwoofers feature a unique pentagonal cone that provides a large surface area for high-performance bass output. Despite the pentagonal cone, the woofers are built int...Table 6.5.2: Surface Area formulas; Geometric Figure . Surface Area Formula . Surface Area Meaning \(S A=2 B+P h\) Find the area of each face. Add up all areas. \(S A=B+\dfrac{1}{2} s P\) Find the area of each face. Add up all areas. \(S A=2 B+2 \pi r h\) Find the area of the base, times 2, then add the areas to the areas of the …If you own an apartment complex, you know how hard it can be to keep things looking great. There’s plenty of surface area to cover when it comes to Expert Advice On Improving Your ...Find the surface area of a sphere having diameter 12 cm. Answers. 1. The radius of the cylinder is r = 4/2 = 2 cm and the height is h = 6 cm. Hence the surface area of this cylinder is 2.The surface area of a sphere refers to the total area covered by its curved outer surface. A sphere is a perfectly symmetrical three-dimensional geometric shape where all points on its surface are equidistant from its center. To calculate the surface area of a sphere, you can use the following formula: Surface Area = 4πr² … Sphere Surface ...Aerospace prime Northrop Grumman is leading a team that includes AVL, Intuitive Machines, Lunar Outpost and Michelin to design a vehicle to transport Artemis astronauts around the ...

A short video on how to show the surface area of a sphere with radius 'r' is 4πr². The area of a circle is πr². The surface area of the sphere is equal to 4 circles of the same radius.. Ok ru download

sphere surface area

A sphere of radius r has surface area 4πr 2.. The surface area (symbol A) of a solid object is a measure of the total area that the surface of the object occupies. The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for …Surface Area of a Sphere. ... Surface Area of a Cone. Click here for Questions and Answers. Practice Questions. Previous: Surface Area Videos. Next: Vectors Videos. GCSE Revision Cards. 5-a-day Workbooks. Primary Study Cards. Search.For example, the surface area of a cube is calculated using the formula: Surface Area of a Cube=6×side². This formula arises because a cube has six identical square faces, and the area of each square is the side length squared. Another example is the sphere. The formula for a sphere’s surface area is Surface Area of a …The area of a sphere and the surface area of a sphere are the same. The surface area is the quantity that covers the entire sphere. The formula for the surface area of a sphere is V = 4 * pi* r ...Surface Area = 4 x π x Radius2 A sphere has a radius of 10 Surface Area = 4 x π x 102 Surface Area = 4 x 3.14159 x 100 Surface Area = 1256.63 Step 1: Convert volume to radius Radius = 3√((3 x Volume)…surface area of a sphere gives us just such an answer. We’ll think of our sphere as a surface of revolution formed by revolving a half circle of radius a about the x-axis. We’ll be integrating with respect to x, and we’ll let the bounds on our integral be x 1 and x 2 with −a ≤ x 1 ≤ x 2 ≤ a as sketched in Figure 1. x1 x2 The surface area of an arbitrary (n − 1)-sphere is proportional to the (n − 1) st power of the radius, and the volume of an arbitrary n-ball is proportional to the n th power of the radius. Graphs of volumes (V n) and surface areas (S n−1) of n-balls of radius 1. The 0-ball is sometimes defined as a single point.The surface area of an arbitrary (n − 1)-sphere is proportional to the (n − 1) st power of the radius, and the volume of an arbitrary n-ball is proportional to the n th power of the radius. Graphs of volumes (V n) and surface areas (S n−1) of n-balls of radius 1. The 0-ball is sometimes defined as a single point.Algae is a green, slimy substance that can be found on many surfaces, including vinyl siding. It often grows in humid climates and thrives in areas where Expert Advice On Improving...Surface Area of a Sphere. The Greek mathematician Archimedes discovered that the surface area of a sphere is the same as the lateral surface area of a cylinder having the same radius as the sphere and a …The volume of the cuboid is 12 cm 3. The surface area of a 3D shape is the total area of all the faces. A cube has six faces which are all squares. The area of one face is: \ (5 \times 5 = 25 ...A sphere is a perfectly round 3 dimensional object (i.e. a ball!). Enter in the radius of the sphere below to calculate the surface area of a sphere and use the formula for calculating the surface area of a sphere given below to work backwards if you have the surface area of a sphere and are trying to solve for the radius of a sphere. Also ...Sphere Surface Area. The area covered by the outer surface of the sphere is known as the surface area of a sphere. It is measured in square units. Hence, the formula to find the surface area of a sphere is: Surface Area of Sphere, S = 4πr 2. In terms of diameter, the surface area of a sphere is given as S = 4π(d/2) 2, where d isIn the above example, the radius of the sphere is 8 cm. If the diameter is given, divide the diameter by 2 to get the radius. Step 2: Now, surface area of sphere = 4 π r 2, so after substituting the value of r = 8, we get, surface area of sphere = 4 π r 2 = 4 × 3.14 × 8 2 = 4 × 3.14 × 64 = 803.84. Step 3: Hence, the required ratio of their surface areas is 1:25. Example : Find the radius of the sphere if the surface area of the sphere is 300 inch 2. Solution: Since we know the surface area of sphere = 4\[\pi\] r 2. 300 = 4 x \[\frac{22}{7}\] x r 2. r 2 = 23.86. r= 4.88 inch. Hence the radius of the sphere is 4.88 inches.The sphere has the smallest surface area among all surfaces enclosing a given volume and it encloses the largest volume among all closed surfaces with a given surface area. For this reason, the sphere appears in nature: For instance, bubbles and small water drops are roughly spherical, because the surface tension locally minimizes surface area..

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