In a circle of radius 21cm,an arc substends an angle of 60degree at the centre .find a)the length of the arc
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Step-by-step explanation:
Length of Arc APB =Thita/360° × (2πr)
= 60°/360° × 2 × 22/7 × 21
= 1/6 × 2 × 22/7 × 21
= 22cm
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