Question

From a solid cylinder of height 14 cm and base diameter 7 cm, two equal conical holes each of radius 2.1 cm and height 4 cm is cut off. Find the volume of remaining solid.

Answer 1

first find the volume of a cylinder using the formula: pir^2h

volume of a cylinder is 539..............1

then volume of a 2 cones=2*1/3pir^2h

=36.96cm^3.............2

then the volume of remaining solid =eq.1-eq.2

=539-36.96=502.04cm^3.

therefore,the volume of remaining solid is 502.04cm^3.