SSC CGL 18 Aug 2021 Shift 2 Paper

Question : 69 of 100

Marks: +1, -0

The perimeter of a semi-circle is

25.7 {cm}

. What is its diameter (in

{cm}) ?(π=3.14)

Solution:

Given, perimeter of semi circle is

=25.7 {cm}

⇒ \;\; π r+2 r=25.7

⇒ 3.14 r+2 r=25.7 \;\; [ ∵ π=3.14]

⇒ \;\; 5.14 r=25.7

⇒ \;\; r=5 {cm}

∴ \;\text " Diameter of semi-circle "\;

\;\;\; =2 r=2 × 5=10 {cm}

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