Question

A sphere has a radius of 10.5 cm. find its
I) volume,and
2) surface area.​

Answer 1

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Radius = r = 10.5 cm

Volume = 4/3 πr³

             = 4/3 × 22/7 × 10.5 × 10.5 × 10.5

             = 4851 cm³

Surface area = 4πr²

                      = 4 × 22/7 × 10.5 × 10.5

                      = 1386 cm²

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Answer 2

Heya!!

Here's your answer!!

Solution :

r = 10.5 cm = 21/2 cm

i) volume of sphere = 4/3 πr³

$\bold{ = \frac{4}{3} \times \frac{22}{7} \times \frac{21}{2} \times \frac{21}{2} \times \frac{21}{2} \: = 4851 {cm}^{3} }$

ii) surface area = 4πr²

$\bold{ = 4 \times \frac{22}{7} \times \frac{21}{2} \times \frac{21}{2} } \: = 1386 {cm}^{2}}$

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