text: ##### In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find the length of the arc.
  
  Given:
  
  Radius of circle = 21 cm
  
  Angle subtended by the arc = 60°
  
  Length of arc = × 2πr
  
  = × 2 × × 21 = 22 cm
  
  Hence, the length of the arc is 22 cm.
  
  14
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