Question

9. Find the volume of metal used in making a pipe of external
l radius 3 cm and width 0.5 cm.
10. Find the surface area of a hollow cylinder of internal radius 3 cm, width 0.5 cm and height 7 cm.​

Answer 1

9th Question In up.

10th Question:

Wide is 0.5 cm. i.e. external radius is R=3+0.5=3.5 cm. The surface area of a hollow cylinder is given by, Therefore, the surface area of a hollow cylinder is 154 square centimeter.

HOPE IT HELPFULL TO YOU.

THANK YOU !!!!!!!!