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Proof Prompt (D)

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

Proof Prompt (D)