A=pi*radius2=pi*(diameter/2)2
A=pi*(45/2)2 = 1589.625 square feet if pi=3.14
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A 45-foot diameter circle has an area of 1,590.4 square feet.
Using 3.14 as Pi the area of circle is: 6358.500000000001
Area of circle = Pi x diameter2/4 = 3.142 x 49/4 = 38.49 sq ft
A 45-foot circumference circle has an area of: 161.1 square feet.
The circumference of a circle with a diameter of 45 inches is 141.37 inches.