Question

A circle of radius 10.5 cm is rotated about its diameter. Find the surface area
and the volume of the solid generated.​

Answer 1

Answer:

When you will rotate a circle about its diameter, you will obtain a sphere.

Therefore, the radius of the sphere will the same as that of the circle, i.e., 10.5 cm.

Hence, volume of sphere = 4/3πr^3

= 4/3 * 22/7 * 10.5 * 10.5 * 10.5

= 4851 cm^3

Answer 2

Answer:

CSA of sphere:- 1386

volume :- 4851

Step-by-step explanation:

when you will rotate a circle about its diameter you will obtain a sphere

radius of circle 10.5

CSA of sphere = 4πr2

4*22/7*10.5*10.5 = 1386

volume = 4/3πr3

4/3*22/7 *10.5*10.5*10.5 = 4851cm3