Question : The area of a circle is 1386 cm2. What is the radius of the circle? [Use $\pi= \frac{22}{7}$]
Option 1: 7 cm
Option 2: 14 cm
Option 3: 18 cm
Option 4: 21 cm
Correct Answer: 21 cm
Solution : The area of a circle is $\pi r^2$, where $r$ is the radius of the circle. Given that the area = 1386 cm 2 $⇒1386 = \frac{22}{7} r^2$ $⇒r^2=441$ $⇒r = 21$ Hence, the correct answer is 21 cm.
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