Question

A cylinder is closed at both the ends by 30cm high cones. The radius of the cylinder is 21m and the total height of the solid is 140cm. Find the volume of this solid

Answer 1

Step-by-step explanation:

For all figures,

r=7 cm

l (slant height)= h (height of cylinder)=4 cm

T.S.A of the figure= C.S.A of Cone+C.S.A of cylinder +C.S.A of hemisphere.

CSA of cone: πrl=(3.14)×(7cm)×(4cm)=87.92 cm2

CSA of cylinder: 2πrh=(2)×(3.14)×(7cm)×(4cm)=175.84 cm2

CSA of hemisphere: 2πr2=(2)×(3.14)×(7cm)2=307.72 cm2

Adding all: TSA of figure=  571.48 cm2