Question

The radius of a circle is 14. Using π, which equation expresses the ratio of the circumference of the circle to the circle's diameter?

Answer 1

`(c)/(28)=\pi`

Explanation:

The circumference
`c` of circle of radius
`r` is given by

`c=2\pi r`,

and the diameter
`d` is 2 times the radius:

`d=2r`.

Therefore, the ratio of the circumference to the diameters is

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

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

Putting in
`d= 2r =28`, we get

`\boxed{ (c)/(28)=\pi}`