Circumference divided by diameter
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Circumference of a circle divided by its diameter is equal to pi
Pi is the ratio of circumference to diameter. C/d=pi always!!!
The ratio is pi, a transcendental number, which is a subset of irrational numbers. pi is approximately equal to 3.14159
Pi is the ratio of a circle's circumference to its diameter, about 3.14159. Pi radians is equal to 180 degrees.
Circle and square are two entirely different shapes. But the ratio of areas of square to circle if their perimeter is equal is pi/4.