SSC CHSL 24 Mar 2018 Shift 2 Paper

Section: English Language

Question : 22 of 100

Marks: +1, -0

The area of a semicircle is

308cm^2

. Calculate its perimeter (in cm).

Solution:

Let radius of semi circle =

r

cm
Area =

{πr ^2 }/2 = 308

⇒

22/7 × 1/ 2 × r ^2 = 308

⇒

r^2 = 308 ×7/ 11 =196

⇒

r = √196 = 14

cm
∴ Perimeter of semi circle =

πr + 2r

( 22 /7 × 14) + (2 × 14)

44+28=72

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