Asked by kyle

The radius of one sphere is twice as great as the radius of a second sphere.

Find the ratio of their surface areas.
Answered by Steve
4π(2r)^2 / 4πr^2 = 4
the square of the radius ratio
Answered by kyle
Find the surface area of an orange with a 3'' radius.
Answered by Steve
The formula is above. Plug in r=3.

We will assume a smooth, rather than a dimpled, surface :-)
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