99 Points of Intersection: Examples-Pictures-Proofs - Hardcover

Walser, Hans; Pedersen, Jean

Hardcover

ISBN 10: 0883855534 ISBN 13: 9780883855539

Publisher: American Mathematical Society, 2006

Synopsis

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.

About this title

Book Description

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.

About the Author

Hans Walser is lecturer at the Swiss Federal Instititute of Technology and the University of Basel.

About this edition

• Publisher: American Mathematical Society
• Publication date: 2006
• ISBN 10: 0883855534
• ISBN 13: 9780883855539
• Binding: Hardcover
• Number of pages: 152