##### In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find the length of the arc.

Given:

Radius of circle = 21 cm

Angle subtended by the arc = 60°

Length of arc = × 2πr

= × 2 × × 21 = 22 cm

Hence, the length of the arc is 22 cm.

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