The figure below shows 4 congruent circles, each tangent to 2 other circles and to 2 ... a side of the square is 24 inches, then what is the area, in square inches, of 1 circle? A. 9 B. 9π C. 36 D. 36π E. 144. ... D The length of one side of the square is equivalent to the diameter of two circles: 24 = 2d. d = 12. Next, find the radius:.