Question

THE CIRCUMFERENCE OF A CIRCLE IS 13π. WHAT IS THE RATIO OF ITS CIRCUMFERENCE TO ITS DIAMETER?

Answer 1

That doesn't depend on the circumference. You should know the formula that gives you the circumference from the radius/diameter otherwise look it up.

Answer 2

We all know that the formula for the circumference is as follows:\[C = 2\pi R\]

and the relationship between the diameter and radius is the following:
\[R = D/2\]

Now write down the given and these formulas on paper, and give it a -one-more-time of thought ^_^ you can do it!