SSC CHSL 10 Jan 2017 Shift 3 Paper

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Question : 82 of 100

Marks: +1, -0

The total surface area of a hemisphere is 1848 sq cm, what is its radius? (Take π = 22/7)

28 cms
7 cms
21 cms
14 cms

Solution:

Let radius of hemisphere = r cm
Total surface area of hemisphere =

3πr^2 = 1848

⇒

r^2 =1848/ {3π}

⇒

r^2 = 616 × 22/7

⇒

r^2 = 28 × 7 = 196

⇒

r=√196=14

cm

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