Question

Find the volume and surface area of a sphere of radius 2.1 cm.​

Answer 1

V

≈

38.79

r

Radius

Unit Conversion:

Solution

V

=

4

3

π

r

3

=

4

3

·

π

·

2.1

3

≈

38.79239

Answer 2

Surface area of sphere

$= 4\pi {r}^{2} = 4 \times \frac{22}{7} \times {(2.1)}^{2} =55.44 {cm}^{2}$

Volume

$= \frac{4}{3} \pi {r}^{3} = \frac{4}{3} \times \frac{22}{7} \times {(2.1)}^{3} = 38.8 {cm}^{3}$