Question

circle o has a circumference of 86 cm. what is the length of the radius of the circle?

Explanation:

Step1: Recall circle - circumference formula

The formula for the circumference of a circle is $C = 2\pi r$, where $C$ is the circumference and $r$ is the radius.

Step2: Solve for the radius

Given $C = 8\pi$ cm, we substitute into the formula: $8\pi=2\pi r$. Divide both sides of the equation by $2\pi$. $\frac{8\pi}{2\pi}=\frac{2\pi r}{2\pi}$.

Answer:

$4$ cm