An ellipse has some model standard form values, a, b, and c which are easily enough to identify from the graph and parts of the graph related to the ellipse's graph. Seeing the right triangle relating a, b, and c, is easy enough. The Pythagorean Theorem is used to relate these three values. I have been hoping to find and SEE the values of a, b, and c in their right triangle for a hyperbola, but I just cannot find this triangle. I have looked in a couple of College Algebra textbooks, and the most that is done is to assign a substitution as part of the derivation of the equation for the hyperbola. That just does not help to show where to find the right triangle. [tex]a^2+b^2=c^2[/tex] comes simply from the part of [tex]c^2-a^2[/tex] but no picture to support it.