Elementary projective (line) geometry
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Video Lecture 11 of 19
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Date Added: March 14, 2015

Lecture Description

Elementary projective geometry is just the geometry of a line, or straightedge. It was introduced by Pappus around 300 A.D., and is ideally suited for K-6 education. This video introduces some basic notions: the join of two points, and the meet of two lines, and definitions of side, vertex, triangle and trilateral. Then we examine a remarkable correspondence between quadrangles and quadrilaterals. The three diagonal points and diagonal sides feature prominently in this construction.

You will want to follow along with these constructions, on your own piece of paper with a pen or pencil and ruler.

Course Description

Feel like learning mathematics from the ground up? Here is your chance: K-6 mathematics explained intuitively but accurately in a novel way by a professional pure mathematician.

The series is meant for those who are teaching public or high school, parents who have children in those years, and anyone who would like to strengthen their understanding of the subject.