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September 20, 2014

September 20, 2014

Posted by **Acorn** on Monday, September 1, 2008 at 1:56pm.

The answer in the back of the book read:A=24r^2...How did they get this answer? Thanks for helping!

- pre-calculus -
**David Q**, Monday, September 1, 2008 at 2:06pmSay the radius of the sphere is r. The sphere touches both sides of the cube, so the distance between two faces of the cube is 2r. But that also equals one edge, so one side of the cube has area 2r x 2r = 4rē. But a cube has six such sides...

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