compute power of a given point with respect to a given circle
The power of point P with respect to circle c is −R2+d2 where d is the distance from point P to the center of c, and R is the radius of c.
The command with(geometry,powerpc) allows the use of the abbreviated form of this command.
_EnvHorizontalName ≔ a:_EnvVerticalName ≔ b:
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