Draw a regular nonagon. If we label the vertices of the polygon sequentially, starting from A, we can draw three line segments: AB, AC, and AE.

Show that AB + AC = AE.

(In reply to A simple geometric proof (no trig) by WryTangle)

To be completely formal, halfway through my proof (after "Draw line from B to point P on AE such that BP = AB."), I should have included:

Draw line CP.

Posted by WryTangle on 2004-11-26 20:02:29