what is pi
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Pi is the ratio of a circle's circumference to its diameter. ... So, for any circle, dividing its circumference by its diameter will give you the exact same number: 3.14159…or pi. Pi is also an irrational number, which means that its value cannot be expressed exactly as a simple fraction.
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Succinctly, pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle's size, this ratio will always equal pi. In decimal form, the value of pi is approximately 3.14.
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