Q6 of 157 Page 819

Find the length of the arc of a circle of diameter 42 cm which subtends an angle of 60° at the centre.

Given:

Diameter of circle = 42 cm


⇒ Radius of circle = cm = 21 cm


Angle subtended at the centre = 60°


∵ Length of arc = × 2πr


=


= 22 cm


Hence, the length of the arc is 22 cm.


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