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en.wikipedia.org/wiki/Sphere

A sphere is a perfectly round geometrical object in three-dimensional space that is the surface of a completely round ball Like a ...

www.mathopenref.com/spherearea.html

Animated demonstration of the sphere suurface area calculation.

www.varsitytutors.com/hotmath/hotmath_help/topics/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 ...

brilliant.org/wiki/surface-area-sphere

To prove that the surface area of a sphere of radius r is 4πr2, one straightforward method we can use is calculus. We first have to realize that for a curve ...

www.math.hmc.edu/funfacts/ffiles/20004.2-3.shtml

From the Fun Fact files, here is a Fun Fact at the Medium level: Surface Area of a Sphere. The area of a disk enclosed by a circle of radius R is Pi*R2.

www.teacherschoice.com.au/Maths_Library/Area%20and%20SA/area_2.htm

NOTE: The value of p can never be known exactly, so surface areas of spheres cannot be calculated exactly. Common approximations for p are: 3.14, and 22/7.

math2.org/math/geometry/areasvols.htm

Math2.org Math Tables: Areas, Volumes, Surface Areas ... Areas. square = a2. rectangle = ab. parallelogram = bh. trapezoid = h/2 (b1 + b2) ... sphere = (4/3) [pi]  ...

www.math.com/tables/geometry/surfareas.htm

Surface Area of a Sphere = 4 pi r 2. (r is radius of circle)

www.mathsteacher.com.au/year10/ch14_measurement/19_sphere/20sphere.htm

A sphere is a body bounded by a surface whose every point is equidistant (i.e. the same distance) from a fixed point, called the centre. For example, a shot (a ...