Question : If the circumference of a circle is 13.2 cm, then what is its radius?
Option 1: 1.7 cm
Option 2: 6 cm
Option 3: 21 cm
Option 4: 2.1 cm
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Correct Answer: 2.1 cm
Solution : Given: Circumference of the circle = 13.2 cm Let the radius be $r$. We know the circumference of the circle = $2\pi r$ ⇒ $13.2 = 2\pi r$ ⇒ $13.2=2× \frac{22}{7}×r$ ⇒ $r = \frac{13.2\times 7}{2\times 22}$ ⇒ $r = 2.1$ cm Hence, the correct answer is 2.1 cm.
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