Main Profile

At A Glance

WT41: Conics via projective geometry

Conics, such as circles, ellipses, hyperbolas and parabolas, can be defined purely within projective geometry, as realized by the nineteenth century German mathematician Steiner. This is done by using projectivities. There are essentially two dual constructions, one giving a line conic, the other a point conic. We illustrate using The Geometer's Sketchpad, a useful software program for students of geometry. This video is part of the WildTrig series, which introduces Rational Trigonometry and applies it to many different aspects of geometry.
Length: 08:46


Questions about WT41: Conics via projective geometry

Want more info about WT41: Conics via projective geometry? Get free advice from education experts and Noodle community members.

  • Answer

Ask a New Question