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| Math Central | Quandaries & Queries |
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Question from s, a parent: how do you find the radius of a circle if you only know the area of the circle. Do you somehow reverse the Pi formula. Thank you |
Yes, you have the correct idea. The area A of a circle is given by
A = π r2
where r is the radius of the circle and π is approximately 3.1416. Dividing both sides of this equation by π gives
A/π = r2
and hence if you know A, divide it by π and then take the square root to find r.
I hope this helps,
Penny
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