[b]Theorem:[/b][br][br]If [color=#ff00ff][b]2 angles are supplements[/b][/color] of [color=#1e84cc][b]congruent angles[/b][/color] (or the same angle), then [color=#ff00ff][b]those 2 angles are congruent[/b][/color]. [br][br](Feel free to move the white points anywhere on the screen you'd like.) [br][br][br]Write a 2-column (or paragraph) proof that formally proves what this applet informally illustrates.[br]Be sure to draw an appropriate diagram, state what is given, & state what needs to be proven. [br]Then prove it. [br][br]