Question

Cornelius is building a solar system model. He plans on making a circular ring around one of the planets out of wire. He wants to know how long he should make the wire to position around the planet. Select all the formulas that coulr be used to determine the length of the circular ring.

Answer 1

`C = 2\pi r`

`C = \pi d`

Explanation:

Given

A circular ring

Required

The length

Let

`r \to` the radius of the ring

The length is calculated by calculating the circumference of the ring.

This is calculated using:

`C = 2\pi r`

or

`C = \pi d`

Where

`d \to` diameter

and
`d = 2r`