Euclid · Mathematics

The Pythagorean Theorem

Euclid’s proof of the most famous theorem in mathematics - that the square on the hypotenuse of a right triangle equals the sum of the squares on the other two sides - and how he proves it by pure geometry, without measuring anything.

What you'll be able to recall

You learned the Pythagorean theorem and how Euclid proved it (Book I, Proposition 47). State the theorem and explain the idea behind Euclid’s proof.

Leads to Pythagoras.

epoché — a humanities education that remembers you.