4 Projective Geometry: Conics
In the previous chapter1, we used projective geometry to prove Pappus’ Theorem.
Pappus’ Theorem Let A, B and C be three points on a line , and let A′, B′ and C′ be three points on another line ′ in 2. Let BC′ meet B′C at P, CA′ meet C′A at Q, and AB′ meet A′B at R. Then P, Q and R are collinear.
In this chapter, we ...