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In a circle of radius 21 cm an arc subtends an angle of 72° at the centre. The length of the arc is?

13.2 cm
19.8 cm
21.6 cm
26.4 cm

Correct Answer: 26.4 cm

Explanation:

Arc length = 2πr (θ° / 360°)
= 2 x (22/7) x 21 x (72° / 360°) cm
= 26.4 cm

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