The diameter of a big trundle wheel is 50 cm

Question

A) How far does it roll along the ground in on turn( correct to one decimal place)?

 

b) If the diameter were 100 cm, how much further would it have rolled?

 

C) If the diameter of a circle is double, what happens to the circumference?

Answer 1

Kevin,

The distance a wheel travels along the ground is equal to the number of revolutions times the circumference.  So for one turn, the distance is the circumference.

 

C = 2πr = πd

 

a)  distance  = C = π(50) = 157.1 cm

 

b)  distance = C = π(100) = 314.2 cm

 

c)  when the diameter is doubled, the circumference is doubled.