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Question
In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. The length of the arc is
Options
21 cm
22 cm
18.16 cm
23.5 cm
Solution
We have r = 21 cm and θ = 60°
Length of arc `=theta/360^circxx2pi"r" = 60^circ/360^circxx2xx22/7xx21 = 22 "cm"`
Hence, the correct answer is option (b)
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