Coxeter-Figure 8.2 A (right)
8.22: To construct the polar of a given point C, not on the conic, draw any two secants PQ and RS through C to form an inscribed quadrangle ABC; then the polar joins the two points
and RP.QS. That is, the polar of C is AB.
Axele de simetrie ale unei figuri geometrice
Triangle to Square Puzzle
Discovering the Pythagorean Theorem