2pi.........full circle......

2 * pi =

6.28318530718

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What is 2 pi r used for?

To find the circumference of a circle, I know how to use 1) Pi *Diameter 2) 2*Pi*R But some people have told me about Pi*R*squared.Jan 30, 2001

What is the difference between these two Pi formulas? - Math Forum ...

mathforum.org/library/drmath/view/58312.html

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What is 2 pi R mean?

chord: a line segment within a circle that touches 2 points on the circle. circumference: the distance around the circle. diameter: the longest distance from one end of a circle to the other. origin: the center of the circle. pi ( ): A number, 3.141592..., equal to (the circumference) / (the diameter) of any circle.

Circles - Math.com

www.math.com/tables/geometry/circles.htm

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Is Pi infinite?

Because π is irrational, it has an infinite number of digits in its decimal representation, and it does not settle into an infinitely repeating pattern of digits. There are several proofs that π is irrational; they generally require calculus and rely on the reductio ad absurdum technique.

Pi - Wikipedia

https://en.wikipedia.org/wiki/Pi

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Why is a full circle 2 pi?

A radian is an arc equal in length to the radius of the circle. Pi is the ratio of the circumference to the diameter of the circle. ... Therefore, a full circle or one complete revolution of the circle corresponds to an angle of 2π radians.

Geometry: Why are there [math]2\pi[/math] radians in a circle ...

https://www.quora.com/Geometry-Why-are-there-2-pi-radians-in-a-circle

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2 Pi or Not 2 Pi?—Wolfram Blog

blog.wolfram.com/2015/06/28/2-pi-or-not-2-pi/

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Jun 28, 2015 - Pi or Tau? An investigation into whether the scientific community should downgrade Pi in favor of the presumably more natural number 2 Pi.