Question

A circle has a circumference of 153.86 units.
What is the diameter of the circle?

Answer 1

diameter = 49 units

Explanation:

The fromula of a circumference of a circle:

`C=2\pi r`

r - radius

or

`C=d\pi`

d - diameter

Use the second formula.

Substitute the value of circumference

`C=153.86`

`d\pi=153.86`

use the approximation of number pi:
`\pi\approx3.14`

`3.14d=153.86` divide both sides by 3.14

`d=49`

Answer 2

ANSWER: 49 units.(Working shown above)