Question

right circular cone, of height 12 ft, stands on its base which has diameter 8 ft. The tip of the cone is cut off with a plane which is parallel to the base and 9 ft from the base. With π = 22/7, the volume, in cubic ft, of the remaining part of the cone is​

Answer 1

refer to the attachment

It very easy by using the frustum formula if the both radius is given of top and bottom

$the \: volume \: of \: frustum \: is \: \\ = > \frac{1}{3} \pi(r1 ^{2} + r2r1 + r2 ^{2} )$