Question

The radius of a sphere is 21cm find its area and volume​

Answer 1

Area = 5164.8 cm; volume = 38792.4 centimeters

Explanation:

Since the radius is known, we can substitute it for r in the first formula.

A = 4πr²

A = 4π(21)²

A = 4π(411)

A = 12.566370614359 * 411

A = 5164.8

V = 4/3πr^3

V = 4/3π21^3

V = 4/3π(9261)

V = 4.1887902047863 * 9261

V - 38792.4

Answer 2

5544cm (squared)

Explanation:

Surface area of a sphere=4πr (squared) =4× 7/ 22 ×21×21cm (squared)

Surface area of the sphere=5544cm

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