If the area of a circle is 154 $c m^{2}$ , then its circumference in cm is

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Solution

Area = $π \times r^{2}$ = $\frac{22}{7} \times r^{2}$ = $154 \to r = 7 c m .$
Thus circumference = $2 π r = 2 \times \frac{22}{7} \times 7 = 44 c m .$

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