Area
45/45/90 and 30/60/90 Special Right Triangles
Another Vi Hart video that ties in nicely... enjoy.
Did you know that Pythagoras was rumored to be a cosmologist and leader a "way of life" movement? There is NO written evidence that he in fact created or proved the Pythagorean Theorem to be true. Click here if you like to read more about who actually "invented" this famous theorem.