Find the area of a circle circumscribed about an equilateral triangle whose side is 18 inches long. a. 81 b. 108 c. 243

asked Oct 23, 2016 234k views

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Find the area of a circle circumscribed about an equilateral triangle whose side is 18 inches long.

a. 81
b. 108
c. 243

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4 votes

See attached for work.

$s=18\rightarrow r=6\sqrt3\rightarrow A_\odot=\pi(6\sqrt3)^2=\boxed{108\pi\ in^2}$

Lovubuntu answered Oct 28, 2016

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