In a circle of diameter 42cm ,if an arc subtends an angle of 60 ˚ at the centre where ∏=22/7,then the length of the arc is
(a) 22/7 cm
(b) 11cm
(c) 22 cm
(d) 44 cm

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Diameter of circle = 42 cm
Radius = 42/2 = 21 cm
Central angle = 60°
We know that,
Length of the arc = θ/360 (2πr)
= 60/360 x 2 x 22/7 x 21
= 22
Length of the arc is 22 cm.
Hence, Option (C) 22 cm is correct.
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