15.9 square metres.
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A 45-foot diameter circle has an area of 1,590.4 square feet.
The circumference of a circle with a diameter of 45 inches is 141.37 inches.
Using 3.14 as Pi the area of circle is: 6358.500000000001
A=pi*radius2=pi*(diameter/2)2 A=pi*(45/2)2 = 1589.625 square feet if pi=3.14
The idea is to multiply the diameter by pi.