## Most recent change of Circle

Edit made on November 22, 2008 by RiderOfGiraffes at 17:40:43

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WW

HEADERS_END

[[[> IMG:circle1.png ]]]

The circle is a plane curve. It is a conic section.

The circle is defined as the path of a point (locus) which moves such that its distance (called the radius) from a fixed point (called the centre) is a constant.

When the centre is ~~( 0, 0)~~ /*(0,0)*/ and the radius is ~~r~~ /*r*/ the equation of the circle in Cartesian Coordinates is EQN:x^2+y^2=r^2

This is closely related to the Pythagoras' Theorem.

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One of the Named Curves on this site.