Lesson 6 – Perspective of points that belong to the straight line r

Lesson_06

This lesson is dedicated to the perspective of the points that belong to line r and, particularly, to some of the points that are notable because of their position.
The perspective of a point P, that belongs to line r, is the intersection of the projecting line (OP) with the perspective r’ of the line r.

Obviously, any point P that belongs to the straight line r has a perspective P’ that belongs to the perspective r’ of the line. But it is also true that any point Q’ of r’ is the perspective of a point Q that belongs to line r. We say that this correspondence is bi-univocal.

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