The pool has a diameter 20 ft so: r = 10 ft. The pool cover extents 12 inches beyond the edge of the pool. 12 inches = 1 foot Therefore, the radius of the pool cover is : r = 10 + 1 = 11 ft. a. The area of the pool cover: A = r² π = 11² π = 121 π ft² b. The length of the rope: l = 2 r π = 2 · 11 π = 22 π ft.