SSC CHSL 7 Jan 2017 Shift 1 Paper

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Question : 63 of 100

Marks: +1, -0

The curved surface area of a hemisphere is 2772 sq cm, what is its radius? (Take π = 22/7)

42 cms
21 cms
10.5 cms
31.5 cms

Solution:

Let radius of hemisphere = r cm
⇒ Curved surface area =

2πr^2

= 2772
⇒

2×22/7×(r)^2=2772

⇒

(r)^2=2772×22/7

⇒

(r)^2=63× 7=441

⇒

r=√144=21

cm

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