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The total surface area of a hemisphere is 55902 sq.cm. find its radius.
1. 77 cm
2. 70 cm
3. 78 cm
4. 84 cm

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Correct Answer - Option 1 : 77 cm

GIVEN:

T.S.A of hemisphere = 55902 sq.cm

FORMULA USED:

T.S.A of hemisphere = 3πr2

CALCULATION:

Radius = r cm

A.T.Q

3 × 22/7 × r2 = 55902

r2 = (55902 × 7)/(22 × 3)

r2 = 847 × 7 = 11 × 11 × 7 × 7

r = 11 × 7 = 77 cm

∴ Radius of the hemisphere is 77cm.

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