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  1. In a circle of radius 21 cm an arc subtends an angle of 72° at the centre. The length of the arc is ?
    1. 13.2 cm
    2. 19.8 cm
    3. 21.6 cm
    4. 26.4 cm
Correct Option: D

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


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