Word problem

Question

what is the radius of a circle with the circumference of 15.

Answer 1

The formula for Circumference is

 

C = 2(pi)(radius)

 

So if C=15,  plug that in and get

 

15=(2)(pi)(radius)

 

Divide both sides by (2)(pi)

 

15/[(2)(pi)] = radius

 

If teacher wants it exact, the answer will be 

 

15

-----

2(pi)

 

If teacher will accept a decimal point answer, answer will be 2.38732