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1. The circumference of a circle, whose area is 24.64 m² , is :

A. 14.64 m

B. 16.36 m

C. 17.60 m

D. 18.40 m

Solution:

\begin{aligned} ∵ π R^{2} = 24.64 \\ \Leftrightarrow R^{2} = (\frac{24.64}{22} \times 7) \\ \Leftrightarrow R^{2} = 7.84 \\ \Leftrightarrow R = \sqrt{7.84} \\ \Leftrightarrow R = 2.8 m \\ ∴ Circumference : \\ = (2 \times \frac{22}{7} \times 2.8) m \\ = 17.60 m \end{aligned}

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