Geometry Honors Chapter 2 Section 6

2. Read page 61 – the top 4 paragraphs Suggestions:

3. Theorem 2-7 If two angles are supplements of congruent angles (or of the same angle), then the two angles are congruent.

4. Given:  1 and  2 are supplementary;  3 and  4 are supplementary  2   4 Prove:  1   3 Statements Reasons 1.  1 and  2 are supplementary;  3 and  4 are supplementary 1. Given 2. m  1 + m  2 = 180; m  3 + m  4 = 180 2. Definition of supplementary angles 3. m  1 + m  2 = m  3 + m  4 3. Substitution 4.  2   4, or m  2 = m  4 4. Given, Definition of  5. m  1 = m  3, or  1   3 5. Subtraction Prop of =, Definition of  1 2 3 4

5. Theorem 2-8 If two angles are complements of congruent angles (or of the same angle), then the two angles are congruent.

8. Practice Assignment Page 63 1-18