Find the total surface area of the sphere of radius 21 cm.

Given :

The radius of the sphere $= 21 cm$.

To do :

We have to find the total surface area of the sphere.

Solution :

The total surface area of the sphere with radius 'r' is given by, $4πr^2$ sq units.

Tota surface area $= 4 \times \frac{22}{7} \times 21 \times 21$

                               $= 4 \times 22 \times 3 \times 21$

                              $=5544 cm^2$.

Therefore, the total surface area of the sphere is $5544 cm^2$.

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Updated on: 10-Oct-2022

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