Question

Use the image of the circle to identify the length of the radius, diameter, and circumference. Leave all answers in terms of π when necessary.

Answer 1

Radius:
`r=7.5\:units`.

Diameter:
`d=15` units

Circumference:
`C=15\pi`

Explanation:

In the given diagram, the
`d=15` units.

The radius of the circle is
`r=(15)/(2)=7.5\:units`.

The circumference of the circle is given by

`C=\pi d`

We substitute
`d=15` into the formula to obtain;

`C=15\pi`