Homework: pg. 202 #s 6-24
6. DE and BC (possible answer)
7. AB and DE
8. AD and DE
9. plane ABC and plane DEF
10. l; alternate interior angles
11. n; corresponding angles
12. l; same-side interior angles
13. m; alternate exterior angles
14. 90
15. 26x + 22 = 38x – 14; x = 3; Angle KLM = 100
16. 33x + 35 = 26x + 49; x = 2; Angle DEF = 79
17. 17x + 8 = 13x + 24; x =4; Angle QRS = 76
18. Converse of alternate interior angles theorem
19. Converse of Corresponding Angles Postulate
20. Angle 6 = 66, angle 3 = 114. 66 + 114 = 180. Converse of Same-side Interior Angles Theorem
21. angle 1 and 7 both = 99. Converse of Alternate Exterior Theorem
22. KM
23. x – 5 < 8; x <13
24.
1. AD is parallel to BC, AD is perpendicular to AB, and DC is perpendicular to BC
2. AB is perpendicular to BC
3. AB is parallel to CD
Given
Perpendicular Transversal Theorem
2 lines perpendicular to same line  1 lines parallel.