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

We know that

the Area of a circle=pi*r²
the length of a radius of circle circumscribed about an equilateral triangle is
r=b*(√3)/3
where
b> length of a side equilateral triangle> 18 in
then
r=18*(√3)/3=10.39 in

A=pi*(10.39)²=108*pi=339.29 in²

the answer is 339.29 in²

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