Find circumference of a circle, if its area is $154 c m^{2}$ .

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Solution

$\begin{matrix} A r e a o f c i r c l e = 154 π r^{2} = 154 \frac{22}{7} \times r^{2} = 154 r^{2} = \frac{154 \times 7}{22} r = 7 c m c i r c u m f e r e n c e = 2 π r = 2 \times \frac{22}{7} \times 7 = 44 c m . \end{matrix}$

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