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OpenStudy (anonymous):
the area of a circle is 81pi? what is the diameter of the circle
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terenzreignz (terenzreignz):
What's the formula for the area of a circle?
OpenStudy (anonymous):
Area = π × r2
terenzreignz (terenzreignz):
Okay, now compare that with π × r2 = π × 81 it means r^2 must be 81, in that case, what's the radius?
OpenStudy (anonymous):
it don't say
terenzreignz (terenzreignz):
Of course it doesn't, you can find it... you know that r^2 = 81, so r must be equal to...?
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OpenStudy (anonymous):
is the answer 4.5?
OpenStudy (anonymous):
the diameter is twice the radius
OpenStudy (anonymous):
I got it now
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