Question : In a circle with centre O, arc CD subtends an angle of 60° at the centre of the circle whose radius is 21 cm. Calculate the length of the arc CD.
Option 1: 20 cm
Option 2: 18 cm
Option 3: 24 cm
Option 4: 22 cm
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Correct Answer: 22 cm
Solution :
Given: Radius, $r$ = 21 cm and Arc angle = 60°
Arc length = $2\pi r \times \frac{60°}{360°}=2 \times\frac{22}{7}\times 21\times \frac{1}{6}= 22$ cm
Hence, the correct answer is 22 cm.
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