Mathematics, 03.07.2019 08:00 Loowkeychrissy7227

Fill in the missing reason in the proof a) definition of straight angles b) alternate interior angles are congruent c) supplementary angles sum up to 180° d) complementary angles sum up to 180° abc is a triangle given de ||ac given ∠ a = ∠abd alternate interior angles are congruent ∠ c = ∠cbe alternate interior angles are congruent ∠abd + ∠b + ∠cbe = 180° ? ∠a + ∠b + ∠c = 180° substitution

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