Question

Find the volume and surface area of sphere of radius 21 cm

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

HOLA : ❤️


Radius of sphere = 21 cm

We know that ;

Volume of sphere = 4 / 3 π r³

⇒ Volume = 4 / 3 * 22 / 7 * 21* 21 * 21

⇒ Volume = 4 * 22 * 21 * 21

⇒ Volume = 38,808 cm³

Hence, the volume of the sphere is 38,808 cm³

Now, we know that ;

Surface area of sphere = 4 π r²

⇒ Surface area = 4 * 22/7 * 21 * 21

⇒ Surface area = 4 * 22 * 3 * 21

⇒ Surface area = 5, 544 cm²

Hence, the surface area of sphere is 5,544 cm²