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Geometry by Jeremy J. Gray, Matthew F. Esplen, David A. Brannan

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4    Projective Geometry: Conics

In the previous chapter1, we used projective geometry to prove Pappus’ Theorem.

image

Pappus’ Theorem Let A, B and C be three points on a line image, and let A′, B′ and C′ be three points on another line image′ in image2. Let BC′ meet BC at P, CA′ meet CA at Q, and AB′ meet AB at R. Then P, Q and R are collinear.

In this chapter, we ...

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