Compare your segment lengths with those of your partner.[br]1. Are your segments all the same length?[br]2. Calculate the ratios [math]\frac{AD}{DC},\frac{AD}{AC},\frac{DC}{AC}[/math] and compare these with your partner. Are your ratios the same?[br]3. Explain why your last answer has to be true.

4. The triangle above is one of the [b]special right triangles[/b] we'll be working with. It's called a 45-45-90 triangle, or an isosceles right triangle. Use the Pythagorean theorem to calculate [b]exactly[/b] h in terms of L and L in terms of h.[br]h=?[br]L=?