Question
The circumference of a circle, whose area is 24.64 m2 , is :
Answer: Option C $$\eqalign{
& \because \pi {R^2} = 24.64 \cr
& \Leftrightarrow {R^2} = \left( {\frac{{24.64}}{{22}} \times 7} \right) \cr
& \Leftrightarrow {R^2} = 7.84 \cr
& \Leftrightarrow R = \sqrt {7.84} \cr
& \Leftrightarrow R = 2.8\,m \cr
& \therefore {\text{Circumference :}} \cr
& = \left( {2 \times \frac{{22}}{7} \times 2.8} \right)m \cr
& = 17.60\,m \cr} $$
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