1.

In a circle of radius 21cm,an arc substends an angle of 60degree at the centre .find a)the length of the arc​

Answer»

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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