Question : The area of a circle is 1386 cm2. What is the radius of the circle? [Use $\pi=\frac{22}{7}$ ]
Option 1: 21 cm
Option 2: 7 cm
Option 3: 14 cm
Option 4: 18 cm
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Correct Answer: 21 cm
Solution : Given: The area of a circle = 1386 cm 2 Also, the area of a circle = $\pi r^2$, where $r$ is the radius of the circle. ⇒ $1386=\frac{22}{7}\times r^2$ ⇒ $r^2 = 63\times7 $ ⇒ $r=21$ Hence, the correct answer is 21 cm.
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