Assuming the area in question in circular,
area = pi*r*r where r, the radius is half the diameter.
area = pi*7.5*7.5 = 176.7 square feet.
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15 square feet is.
The area in square centimeters is: 176.7
176.71 square inches.
The area of the circle: pi*15*15 = 225*pi square measurements
176.714586764 square inches.