99 Points of Intersection
Examples-Pictures-Proofs

The 99 points of intersection presented here were collected during a year-long search for surprising concurrence of lines. For each example we find compelling evidence for the sometimes startling fact that in a geometric figure three straight lines, or sometimes circles, pass through one and the same point. Of course, we are familiar with some examples of this from basic elementary geometry - the intersection of medians, altitudes, angle bisectors, and perpendicular bisectors of sides of a triangle. Here there are many more examples - some for figures other than triangles, some where even more than three straight lines pass through a common point. The main part of the book presents 99 points of intersection purely visually, developed in a sequence of figures. In addition the book contains general thoughts on and examples of the points of intersection, as well as some typical methods of proving their existence.

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Product details

• Date Published: September 2006
• format: Hardback
• isbn: 9780883855539
• length: 168 pages

• dimensions: 236 x 156 x 13 mm
• weight: 0.357kg
• contains: 157 b/w illus.
• availability: This item is not supplied by Cambridge University Press in your region. Please contact Mathematical Association of America for availability.