Question

The wheel on Ed's chair has a radius of 30 cm. If he travels 540π cm, the wheel will rotate _?_ times.

A) 6
B) 9
C) 12
D) 18

Answer 1

C = 2 × π × R
C = 2 × π × 30
C = 60π cm

540π/60π = 54/6 = 9 times

Answer: b) 9

Answer 2

so travel distance of a wheele
1 rotation distance=1 times circumverence so find circunference
circumfernec=2 times radius times pi
radius=30
30 times 2 time spi=60pi
so 60pi times x revolutions=540pi
divide both sides by 60pi
x revolutions=9
9 revolustion
B is the answer