The foundation for a cylindrical storage shed is a cylinder 26 ft in diameter and 3 ft high. How many cubic ft of concrete are needed to build the foundation​ (to the nearest​ hundredth)?

Answer 1

26 feet diameter = 2r where r= radius of 13 feet

area of cylinder bottom is pir^2 = pi(169)

V= hpir^2 = 3(169)pi = 507pi = about 1,592.8 cubic feet