Question : What is the circumference of a circle whose radius is 10.5 cm?
Option 1: 21 cm
Option 2: 66 cm
Option 3: 30 cm
Option 4: 110 cm
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Correct Answer: 66 cm
Solution : The circumference of a circle is given by the formula $C = 2\pi r$ where $r$ is the radius of the circle. Substituting $r = 10.5$ cm into the formula, $C = 2\pi \times 10.5= 2\times\frac{22}{7} \times 10.5= 66 \text{ cm}$ Hence, the correct answer is 66 cm.
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