assuming that 15 x 15 are the dimensions of the square that ensconces the circle in question. This means that the diameter of the circle is fifteen feet. Therefore the radius is 7.5'.
area = pi x rr
area = 3.14 * 7.5 *7.5
area = 176.715 m**2
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Area of a circle is PI times the square of the radius (half the diameter). 3.1415 x (7.5 squared) = about 176.7 square feet
A 15-foot wide circle has an interior area of 176.71 square feet and a distance around the outside (circumference) of 47.1 feet.
225 square feet.
225 square feet.
15 feet x 3 feet = 45 square feet