Power of a point


The power of a point is a real number that reflects the relative distance of a given point from a given circle. It is related to the distance from the given point to the center of the circle and the radius of the circle. Points inside the circle have negative power, points outside have positive power, and points on the circle have zero power.

Related formulas


hPower of the point (m2)
sDistance of the point from the center of the circle. (m)
rRadius of the circle (m)