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SSC Selection Post 2023 PYQ — Question 71

SSC Selection Post - Matriculation Level - 27 June 2023 - Shift 2 • Quantitative Aptitude • Q71

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The curved surface area of a hemisphere is 693 cm2. Its radius will be ________. (Take π\pi = =227 = {22 \over 7})

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Correct answer: A

Explanation

The correct answer is option 1 i.e. 10.5 cm.

2πr2 = 693

⇒ 2 × (22/7) × r2 = 693

⇒ r2 = (693 × 7)/44 = 110.25

⇒ r = √110.25 = 10.5 cm