The circumference is 565.5 feet. The area is 25,450 square feet. The diameter is 180 feet.
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The radius is 12
I can see no diagram.
If you mean a circle, use the formula for the area of a circle: A = pi x r2.
Find the area of the shaded sector. radius of 3 ...A+ = 7.07
90 degrees. QED.