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 ...

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*R^{2}.

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

This topic is part of the TCS FREE high school mathematics 'How-to Library', and
will help you to find the **surface area** of **spheres**, or the radius if the surface ...

virtualnerd.com/act-math/geometry/solids/sphere-lateral-surface-areas

Then plug that value into the formula for the **surface area of a sphere** and solve to
get ... sphere; surface area; cylinder; relationship between cylinder and sphere ...

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.com/tables/geometry/surfareas.htm

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

math2.org/math/geometry/areasvols.htm

**Surface** Areas. cube = 6 a^{2}. prism: (lateral **area**) = perimeter(b) L (total **area**) =
perimeter(b) L + 2b. **sphere** = 4 [pi] r^{2}. Supporters: Online Education ...