Question

A wheel has a radius of 10 cm. Approximately how far does it travel in 3 revolutions?

A) 47.1 cm
B) 94.2 cm
C) 188.4 cm
D) 376.8 cm

Answer 1

188.4 c you take the radius and double it to get the diameter then you take the diameter and multiply by 3.14 to get circumference after you find the circumference you multiply by 3

so 10×2≈20 20×3.14≈62.8 62.8×3≈188.4

Answer 2

C) 188.4 cm

Explanation:

In order for you to know how far a wheel travels in 3 revolutions, you need to know the circumference of it. A revolution equals the value of the circumference.

The formula to obtain the circumference of the circle is:

π * diameter

Moreover, to obtain the diameter, you need to multiply the radius times 2.

Therefore,

π * 2 (radius) = π * 2(10)

π * (20) = 62.8

The circumference of the circle is 62.8 cm.

Then,

3 * 62.8 = 188.4