Question

find the volume of surface area of sphere of radius 21 cm​

Answer 1

$\bold \green {\underline{Solution:}}$

Given,

• Radius of the sphere.

To Find,

• The volume of surface area of sphere.

Solving,

• Volume of sphere = (4/3πr³) units³

⇒ (4/3 × 22/7 × 21 × 21 × 21) cm³

⇒ 38808 cm³

• Surface area of the sphere = (4πr²) units²

⇒ (4 × 22/7 × 21 × 21) cm²

⇒ 5544 cm²

Answer 2

EXPLANATION.

Radius of the sphere = 21 cm.

As we know that,

Formula of :

Volume of sphere = 4/3πr³.

Surface area of the sphere = 4πr².

Using this formula in the equation, we get.

Volume of sphere = 4/3 x 22/7 x 21 x 21 x 21.

⇒ 4 x 22 x 21 x 21 = 38,808 cm³.

Volume of sphere = 38,808 cm³.

Surface area of sphere = 4 x 22/7 x 21 x 21.

⇒ 4 x 22 x 3 x 21 = 5544 cm².

Surface area of sphere = 5544 cm².

                                                                                                                       

MORE INFORMATION.

(1) Volume of cube = a³.

(2) Volume of cuboid = L x B x H.

(3) Volume of cylinder = πr²h.

(4) Volume of cone = 1/3πr²h.

(5) Volume of hemisphere = 2/3πr³.

(6) Volume of sphere = 4/3πr³.