Question

Find the covered surface area of radius 21 cm. ​

Answer 1

Curved suraface area of a hemisphere = 2Πr2.

= 2 x 22 / 7 x ( 21 )2.

= 2772 cm2.

Answer 2

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The covered surface area of a hemisphere of radius 21cm would be = $2\pi \: r {}^{2}$ = 2× 22/7 ×21 × 21cm2 = 2772 cm2.

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