X72 y-524 x72y52 4. And that is the Standard Form for the equation of a circle. When the center point is the origin 0 0 0 0 of the graph the center-radius form is greatly simplified.
In algebraic terms a circle is the set or locus of points x y at some fixed distance r from some fixed point h k.
The value of r is called the radius of the circle and the point h k is called the center of the circle. For example suppose x - 2 2 y - 3 2 4 2 is an equation of a circle. The new equation is. And that is the Standard Form for the equation of a circle.