Department of Mathematics, Statistics
and Computer Science
Wim Ruitenburg's Spring 2008 MATH025.1001
A picture proof
The following sketched picture proof appears to show that 89 degrees equals 90
degrees.
We easily check, case by case, that the triangles on the left hand side are
congruent to the corresponding triangles on the right hand side.
So 89 degrees equals 90 degrees.
Last updated: April 2008
Comments & suggestions:
wimr@mscs.mu.edu