**The Pythagorean Theorem:**
from the book,
777 Mathematical Conversation Starters

by John de Pillis, page 249, item [612].

**A nice application of this theorem** allows us to
find the optimal choice of pizzas (*communicated
through Tom Lehrer*) is found on page 250, item [615].

**There are dozens of proofs**
of the Pythagorean Theorem.
This proof relies on graphics and uses no algebra
or computation except for the fact that *s*^{2}
is the area of a
square whose sides have length *s*.