Question

the diameter of the wheel of a cycle is 70cm . how far will it go in 250 revolutions?

Answer 1

Diameter of the wheel =70 cm
Radius = d/2=70/2=35 cm
For 1 revolution the wheel moves = circumference of the wheel
= 2*pi*r
=2*22/7*35

=2*22*5
=220cm
For 250 revolutions it moves =250×220
=55000 cm

Answer 2

Diameter of the wheel of a cycle= 70cm
  Radius = d/2 
              =70/2
              =35cm.
The circumference of the wheel will be equal to its one complete revolution. 
{Wheel is in shape of a circle}
Circumference of circle= 2*pi*r
                                       = 2*22/7*35
                                      =220cm
For 250 revolutions it moves the distance = 220*250
                                                                         =5500cm