Assertion: geometry's point | /r/HasProperty | the pole
Facets:
Source sentences:
text: If point R is the inverse of point P then the lines perpendicular to the line PR through one of the points is the polar of the other point (the pole).
text: The fixed point (analogous to the origin of a Cartesian system) is called the pole, and the ray from the pole in the fixed direction is the polar axis.