Power

power(Circumference, Point)

Given a circumference with center $(x_0,y_0)$ and radius $r$, we define the function $f(x,y)=(x-x_0{)}^2+(y-y_0{)}^2-r^2$. Then, given a point $P=(p_x,p_y)$, this function returns $f(p_x,p_y)$.

Internal, External