the largest drum ever constructed was played at the Rotal festival Hall in london in 1987. it had a diameter of 13 ft . what was the area of the circular face of the drum? Solution diameter of the drum = 13ft area of circular face of drum = upper circular area + lower circular area circular area = pi*r^2 r = 13/2 = 6.5 ft therefore, area =2* pi* 6.5^2 = 265.33 square feet.