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

Answer:

A c/pi

B c/2r

C c/d

D c/2pi

Step-by-step 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:

$d = \frac{c}{\pi}$

When we solve for r, we get:

$r = \frac{c}{2\pi}$

When we solve for π, we get:

$\pi = \frac{c}{d}$

or

$\pi = \frac{c}{2r}$

All except the last one are correct