Question: triangle inequality . conditions that guarantee parallelism A. Arrange the angles in descending order (or decreasing size). R 8 10 N C 6 B. Complete

triangle inequality . conditions that guarantee parallelism

triangle inequality . conditions that guarantee
A. Arrange the angles in descending order (or decreasing size). R 8 10 N C 6 B. Complete the proof: Given: AB I| EC and 41 = 24 A Prove: AF I| BC KE 3 2 4 B C Proof: Statement Reason 1. AB I| EC 2. 42 and 23 are supplementary angles 2 . 3. 3. Definition of Supplementary Angles 4. 4. Vertical Angles Theorem 5. 5. Definition of Congruent Angles 6. m41 + m23 = 180 6. 7 . 7. Given 8. m41 = m/4 8. 9 9. Law of Substitution 10. 24 and 23 are supplementary angles 10 11 11

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