Question

The figure given below represents a solid consisting of a right circular                        

cylinder surmounted by a cone at one end. Their common radius is                      

15cm. The height of the cone is 20cm and the total height of the solid is                                

70cm. Find the total surface area of the solid​

Answer 1

Answer:

1539.92cm³

Step-by-step explanation:

The solid can be divided into 3 parts.

The first part is the cone with height 4cm and radius 7cm.

Volume of cone = V1=31πr2h=205.5cm3

The second part is the cylinder with height 4cm and radius 7cm.

Volume of cone = V2=πr2h=615.75cm3

The third part is the hemisphere with radius 7cm.

Volume of cone = V3=32πr3=718.67cm3

The volume of the solid = V1+V2+V3=1539.92cm3