Question

A tire on a toy car has a diameter of 8 cm if the toy car travels 12,560 cm approximately how many times does the tire rotate? Use 3.14 as an approximation of pi

Answer 1

The number of rotations completed by tire = 500.

Explanation:

The diameter of the tire of toy car = 8 cm

Now, DIAMETER = 2 x RADIUS

So, radius of the tire = D/2 = 8/2 = 4 cm

Now, Circumference of the Circle = 2πr

= 2 x 3.14 x 4 = 25.12 cm

Now,
`\textrm{Total  number of rotations}  = \frac{\textrm{Total Area covered}}{\textrm{Area covered in 1 rotation}}`

=
`(12,560)/(25.12)  = 500`

The number of rotations completed by circle = 500.