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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


Team Careers360 19th Jan, 2024
Answer (1)
Team Careers360 23rd Jan, 2024

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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