There is a circular garden in the middle of a square yard. the radius of the circle is 4x. the side length of the yard is 20x.. what is the area of the part o the yard that is not covered by the circle? . a.) 4x(5). b.) 8x^2(5-{pi}). c.) 16x(25+{pi}. d.) 16x^2(25-{pi})