Answer: D) circumference to diameter
Step-by-step explanation:
We know that circumference of a circle is given by :-
[tex]C=\pi d[/tex], where d is the diameter of the circle.
Therefore, the ratio of circumference to diameter of a circle will be
[tex]\frac{C}{d}=\frac{\pi d}{d}=\pi[/tex]
Hence, [tex]\pi \text{ is the ratio of circumference to diameter.}[/tex]
