crystalgonzalez
Answered

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The surface área of the sphere?
A=81 pi in^2

Sagot :

AL2006
It's hard to guess what the question is.

The quantity there apparently has the unit of 'square inches',
so it's already an area.
kate200468
[tex]The\ surface\ area\ of\ the\ sphere=4 \pi r^2\\\\The\ surface\ area\ of\ the\ sphere=81 \pi (in^2)\\\\4 \pi r^2=81 \pi\\4r^2=81\ /:4\\\\r^2= \frac{\big{81}}{\big{4}} \ \ \ \Rightarrow\ \ \ r= \sqrt{ \frac{\big{81}}{\big{4}}} = \frac{\big{9}}{\big{2}}=4.5\ (in)\\\\the\ radius\ of\ the\ sphere\ is\ 4.5\ in[/tex]
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