What geometry theorem is dynamically being illustrated in the applet below? [br](Feel free to move the white points wherever you'd like.)
[b]Therorem:[/b][br][br]If [color=#38761d][b]2 angles are complements[/b][/color] of [color=#1e84cc][b]congruent angles[/b][/color] (or the same angle), then [color=#38761d][b]those 2 angles are congruent[/b][/color].