Geometry – from the Greek; geo meaning earth and metry ...

Supplementary angles are two angles the sum of whose measures is 180°. Theorem 1: Vertical angles are congruent. Theorem 2: If 2 angles are supplements of congruent angles (or of the same angle), then the 2 angles are congruent. Theorem 3: If 2 angles are complements of congruent angles (or of the same angle), then the two angles are congruent. ................
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