Pi (π) is the measure of a circle's diameter (and for that matter, radius) and it's circumference. It's an irrational number and therefore neither repeats nor terminates. The value is estimated (and accepted) to be 3.1415.
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The circumference of a circle or ellipse is its perimeter. Pi is the ratio of the circumference of the circle and the diameter of the circle.
The circumference of a circle or ellipse is its perimeter. That is, if the circle were expanded out and straightened out to a line segment, the circumference would be the arc length of the circle.
We know that the circumference of a circle is given by the formula, πD, where D is the diameter of the circle, therefore, the value of the Pi can be written as,
[tex]\rm Circumference= \pi Diameter\\\\\pi = \dfrac{Circumference}{Diameter}[/tex]
Hence, pi is the ratio of the circumference of the circle and the diameter of the circle.
Learn more about Circumference:
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