SSC CHSL 4 Aug 2021 Shift 1 Paper

Section: Quantitative Aptitude

Question : 64 of 100

Marks: +1, -0

The inner and outer radii of two concentric circles are

6.7 {cm}

and

9.5

{cm}

, respectively. What is the difference between their circumferences (in

{cm})

? (Take

π=\;{22}/{7}

)

Solution:

According to the question,

∴

Required difference

\;\; =2 π(r_{1}-r_{2})

\;\; =2 × π ×(9.5-6.7)

\;\; =2 × \;{22}/{7} × 2.8=17.6 {cm}

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