# Equation of the Circle

## Description

A circle can be defined as the curve traced out by a point that moves so that its distance from a given point is constant. In an x–y Cartesian coordinate system, a circle with center coordinates (a, b), is the set of all points (x, y), with distance r to the center.

Related formulas## Variables

x | The abscissa of the point of the circle (m) |

a | The abscissa of the center of the circle (m) |

y | The ordinate of the point of the circle (m) |

b | The ordinate of the center of the circle (m) |

r | The radius of the circle (m) |