1. Parallel Lines and Transversals
Day 6

2. Parallel Lines
Lines are parallel if they are always the same distance apart and will never meet.

6. What is a transversal ? What is a transversal ?
Answer: a line, like the red one below, that intersects two parallel lines. 

7. What is so special about a transversal?
Answer: When a transversal cuts (or intersects) parallel lines several pairs of congruentand supplementary angles are formed.

8. Angles formed by a transversal

9. Exterior vs. Interior

10. What angles are formed?

15. In this example, these are corresponding angles:
a and e
b and f
c and g
d and h

25. Answer on separate sheet of paper
Identify each pair of angles.
1. 1 and 3
2. 3 and 6
3. 4 and 5
4. 6 and 7
corr. s
alt. int. s
alt. ext. s
same-side int s