Question

In a circle of radius 10.5 cm an arc substends an angle of 60 at the centre. Find the length of the arc

Answer 1

It will form a sector of angle 60 degree.
  
Now we know that length of arc=theta/360*2*pi*r
                                                  =60/360*2*22/7*10.5
                                                  =1/6*44*10.5
                                                  =1/60*44*105
                                                  =77 cm