Question

a wheel with the diameter 14 cm made 15 complete revolutions on a street. what distance did the wheel travel

Answer 1

C = π × d 
   = 3.14 × 14
   = 43.96

Distance = 15 × 43.96
  
                                   = 659.4 cm 

Answer 2

Diameter= 14 cm
1 revolution of the wheel = Circumference
Circumference- 2πr
,=2 x 3.14 (value of π= 3.14) x 7 ( r= 14/2= 7)
=14x 3.14
=43.96 cm
If C =43.96 cm, distance covered with 1 revolution = 43.96 cm
Therefore, Distance covered in 15 complete revolutions= 15 x 43.96
                                                                                =659.4 cm
Ans: The wheel  after 15 revolutions travelled the distance of
                                                        659.4cm or 6.594m.