the best range attracted through the two things of contact of this two tangents drawn from certain suggest confirmed conic part. The provided point is known as the pole of the range. If the given point lies inside the curve so the two tangents become imaginary, there clearly was nonetheless an actual polar line which cannot meet with the curve, but which possesses various other properties of the polar. Thus the focus and directrix are pole and polar. There are also poles and polar curves to curves of higher degree compared to 2nd, and poles and polar planes to areas of second-degree.
An Airplane bend whose point-equation is derived from compared to another jet curve (regarding which it is said to be a polar) by operating more than one times (according because it's very first, 2nd, etc., polar) with all the symbolization x′ . d/ d x + y'. d/ d y + z'. d/ d z, in which x', y', z' would be the trilinear coördinates of a set point (that the bend is said to be a polar).
outstanding circle two of whoever things tend to be each a quadrant from a given point: it's the polar of provided point.
Given a trihedral; every single face from vertex erect a perpendicular ray on the same side since the third advantage; the trihedral they form could be the polar of this given one.