Question

The diameter of a wheel is 42cm. How many revolutions will the wheel make if it travels 1.98km?

Answer 1

the circumference of a circle = 2πr (r= radius)
                                                = 2×22/7×42/2
                                                =132 c.m
distance covered by wheel in 1 revolution = 132 c.m or  1.32 meters
      1.98km = 1980 meters so,
   no of revolutions made by a wheel is = (1980/1.32)meters
                                                                = 1500 revolutions