But given an h, what is going to be the area of this triangle? Well, this is a 45, 45, 90 triangle. If this is 90, then this is going to have to be 45 degrees, that's going to have to be 45 degrees, and we know that the sides of a 45, 45, 90 triangle are square root of 2 times the hypotenuse. So this is going to be square root of 2, sorry, square root of 2 over 2 times the hypotenuse. Square root of 2 over 2 times the hypotenuse. And you can get that straight from the Pythagorean theorem. If this side, let's say it's length a, then this side has length a, so you're going to have a squared plus a squared is equal to the hypotenuse squared, or 2a squared is equal to the hypotenuse squared, or that a squared is equal to the hypotenuse squared over 2, or that a is equal to h over the square root of 2, which is the same thing as the square root of 2h over 2.