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You need to work backwards. the formula for area is r^2pi=A. to find the radius, r, you divide the diameter in half. therefore (d/2)^2pi=Area. plug in your #'s an solve.

Ex. Area=16pi Find diameter.

(d/2)^2pi=16pi divide both sides by pi

(d/2)^2= 16 take the square root of both sides

d/2=4 multiply both sides by 2

d=8

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Q: How do you find diameter using area?
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