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What is the area of a circle, if the diameter is 18?

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Mar 10, 2018

We know that $A = r^{2} π$ $A = r^2pi$ , and that $d = 2 r$ $d = 2r$ . Thus

$18 = 2 r \to r = 9$ $18 = 2r -> r = 9$

$A = 9^{2} π = 81 π \approx 254.47 u^{2}$ $A = 9^2pi = 81pi ~~254.47" " u^2$

Hopefully this helps!

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