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The diameter of a circle is the length of a straight line segment going through the circle and with endpoints on the circle itself.

A ratio is a comparison of two numbers using the operation of division. That means that there is no such thing as the ratio of a circle. However, there is a ratio of the circumference of the circle (the length of the path around the circle) and its diameter. That ratio has the value pi, which is about 3.141592653589793...

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Q: What is the ratio and diameter of a circle?
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The ratio of the circumference and diameter any circle?

The ratio of the circumference of a circle to its diameter is Pi. (3.14159)


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