Question

A circular wheel has a diameter of 42 cm. How far will it roll in 5
revolutions?​

Answer 1

659.75 cm

Explanation:

First, find the circumference with the formula C = 2
`\pi`r

The diameter is 42 cm, so the radius will be 21 cm

Plug in the radius into the equation and solve for C

C = 2
`\pi`r

C = 2
`\pi`(21)

C = 131.95

Find how far it will roll by multiplying this by 5

131.95(5)

= 659.75

So, in 5 revolutions, it will roll 659.75 cm

Answer 2

3.142

Explanation: