Question

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

a. 81
b. 108
c. 243

Answer 1

See attached for work.

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