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DCircumfrence to diameter is the answer

Answer:  D)  circumference to diameter

Step-by-step explanation:

We know that circumference of a circle is given by :-

\(C=\pi d\), where d is the diameter of the circle.

Therefore, the ratio of circumference to diameter  of a circle will be

\(\frac{C}{d}=\frac{\pi d}{d}=\pi\)

Hence, \(\pi \text{ is the ratio of circumference to diameter.}\)