goldendragon1971

Saturday, February 4, 2017

1/2 + 14 i is no accident.........Mr. Riemann...........

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Circumference of a circle. Circle illustration with circumference (C) in black, diameter (D) in cyan, radius (R) in red, and centre or origin (O) in magenta. Circumference = π × diameter = 2 × π × radius. The circumference of a circle is the distance around it.

Circumference - Wikipedia

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

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

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

Jan 30, 2001 - 2 posts

Both expressions equal the circumference of a circle, as you stated. The other expression is the AREA of the circle: 2 Area = Pi*R If you attach units to the radius, you can see that one is a length and the other is an area.

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