It's easy to draw a triangle cut into two congruent triangles: draw an
isosceles triangle and bisect the odd angle.

Draw a triangle cut into thirteen congruent triangles.


(This is Macalester College Problem of the Week #751)

There will be a $1 prize for the best correct solution submitted by a
midshipman.

A solution is "correct" if it is clear that the 13 triangles are
congruent. "Best" is hard to evaluate for this problem, so we'll break
ties in favor of "first."  Solutions are due by noon on Thursday,
September 24, 1998.  Submit solutions to Prof. Hanna at
mathprob@nadn.navy.mil, or via the mailbox in Chauvenet 301.

Midshipmen submitting correct solutions to two consecutive problems will
also win a text from the New Mathematical Library donated by Prof.
Novo-Gradac.

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Lots of good answers to problem #74; prize winner to be announced later.