Question

Which of the following ratios can be derived from the formula for the circumference of a circle? Select all

that apply
A c/pi
B c/2r
C c/d
D c/2pi
E d/2c

Answer 1

A c/pi

B c/2r

C c/d

D c/2pi

Explanation:

The formula for the circumference of a circle is

`c = 2\pi \: r`

Or

`c = \pi \: d`

When we solve for d, we get:

`d = (c)/(\pi)`

When we solve for r, we get:

`r = (c)/(2\pi)`

When we solve for π, we get:

`\pi = (c)/(d)`

or

`\pi = (c)/(2r)`

All except the last one are correct