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Volume of a hemisphere is 19404 cubic cm. The total surface area is?

27772 sq. cm
4158 sq. cm
5544 sq. cm
1386 sq. cm

Correct Answer: 4158 sq. cm

Explanation:

(2/3) x (22/7) x r³ = 19404
⇒ r³ = 19404 x (7/22) x (3/2) = 9261 = (21)³
∴ r = 21 cm
Total Surface area = 3πr²
= 3 x (22/7) x 21 x 21 cm²
= 4158 cm²

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