please correct me and explain why. thank you.

The base of a solid is the arca enclosed by the graphs of f(x) = 5\\5x and g(x) = x2. Feedback Find the volume of the solid if slices made perpendicular to the base along the x-axis are semicircles. You have incorrectly calculated the (Express numbers in exact form. Use symbolic notation and fractions where needed.) volume of the solid, You may have used the distance between f(x) and g(x) as the radius of the cross section at x. The distance between the functions V = 5625m gives the diameter of cach semicircular 28 cross section, not the radius. Be sure to Incorrect divide this distance by 2