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A circle has area $154$ cm². Find its circumference (take $\pi = \dfrac{22}{7}$).

A$22$ cm
B$33$ cm
C$44$ cm
D$88$ cm
Answer & Solution
Correct answer: C. $44$ cm
From $\pi R^2 = 154$: $R^2 = \dfrac{154 \times 7}{22} = 49 \;\Rightarrow\; R = 7$ cm. Circumference $= 2 \pi R = 2 \times \dfrac{22}{7} \times 7 = 44$ cm.
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