Most recent change of Circle
Edit made on November 22, 2008 by RiderOfGiraffes at 17:40:43
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[[[> 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.
One of the Named Curves on this site.