Question

The diameter of a circle is 4 cm. Which equation can be used to find its circumstances?

Answer 1

The third answer.

Explanation:

There are two formulas for circumference:

`C = 2\pi r`

`C = d\pi`

They give the diameter of 4, and they are going to use a combination of both formulas for the answer. They are using the second formula and then they are changing the diameter to a radius by dividing by 2.