Interactive exercises demonstrating the SAS inequality theorem (hinge theorem). Notice that "SAS inequality" refers to the hypothesis of the theorem, not the conclusion. That is, the hypothesis involves two pairs of congruent sides and a pair of incongruent included angles. The conclusion is not an inequality between angle measures. It is an inequality between the lengths of the third sides.

[b]Exercise 1[/b][br]Change [math]\alpha[/math] and [math]\beta[/math] so that they are not equal. Observe what happens to the lengths of the opposite sides (BC and EF).[br][br]