Question

find the volume and surface area of a sphere of radius 2.1 CM

Answer 1

Radius of sphere is 2.1 cm
Vol of sphere is 4/3 π r^3
vol. = 4/3× 22/7×2.1×2.1×2.1
vol.= 38.808cm cube
Now S.A.= 4πr^2
= 4×22/7×2.1 ×2.1
=55.44 cm square

Answer 2

Answer:

The volume and surface area of a sphere of radius 2.1 CM are as follows:

volume: 38.8 $cm^{3}$

surface area: 55.44 $cm^{2}$

Step-by-step explanation:

• Radius of sphere, r=2.1 cm

• Volume of sphere = 4/3 π$r^{3}$ = $\frac{4}{3}$ ×$\frac{22}{7}$×$(2.1)^{3}$ = $\frac{4}{3}$ ×$\frac{22}{7}$× 2.1 ×2.1× 2.1 =38.8 $cm^{3}$

• Surface area of sphere =4π$r^{2}$

    =4 × $\frac{22}{7}$ × 2.1 × 2.1

    =55.44 $cm^{2}$

Hence, the volume of the sphere of radius 2.1 cm is 38.8 $cm^{3}$  and surface area of that sphere is 55.44 $cm^{2}$ .