Find the measure of each numbered angle if AB 1. BC. (For review, see Lesson 4-2.) A
5. 22
7. 24
9. 26
2
1 104
6. 3
8. 25
10.27
36
40°
7
5
6
11. 28
B

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem