Mathematics, 17.07.2019 18:00, robertstoll81

Given: lines y and z are parallel, and abc forms a triangle. prove: m∠5 + m∠2 + m∠6 = 180° statements reasons 1. abc is a triangle 1. given 2. y ∥ z 2. given 3. ∠1 ≅ ∠5; ∠3 ≅ ∠6 3. ? 4. m∠1 = m∠5; m∠3 = m∠6 4. def. ≅ 5. m∠1 + m∠2 + m∠3 = m∠lam 5. ∠ addition postulate 6. m∠1 + m∠2 + m∠3 = 180° 6. def. straight angle 7. m∠5 + m∠2 + m∠6 = 180° 7. substitution which could be the missing reason in step 3? alternate interior angles are congruent alternate exterior angles are congruent vertical angles are congruent corresponding angles are congruent

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Given: lines y and z are parallel, and abc forms a triangle. prove: m∠5 + m∠2 + m∠6 = 180° stateme...