Question

find surface area of a sphere whose radius = 10.5 cm​

Answer 1

Given:

Radius of sphere = 10.5cm

To find:

Surface area of sphere.

Solution:

We know that, Surface area of sphere = 4πr²

⇒ 4 (22/7 × 10.5(10.5)) cm²

⇒ 4 (22/7 × 110.25) cm²

⇒ 4( 2425.5/7 ) cm²

⇒ 346.5 cm²

So, the surface area of sphere is 346.5cm²

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Answer 2

Answer:

1386cm.sq

Step-by-step explanation:

$radius \: of \: sphere = 10.5cm \\ surface \: area \: of \: the \: sphere = 4\pi \: r {}^{2} \\ =( 4 \times \frac{22}{7} \times 10.5 \times 10.5) \\ = 1386cm ^{2}$

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