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Question
In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find the length of the arc. (Use π = `22/7`)
Solution
Radius of the circle (r) = 21 cm
Angle subtended by the given arc = 60°
Length of the arc of the sector having angle = `theta/(360^circ) xx 2pi"r"`
= `(60°)/(360°) xx 2pi(21)`
= `1/6 xx 2 xx 22/7 xx 21`
= `1/6 xx 2 xx 22 xx 3`
= 22 cm
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