18. Pair of Angles:
• corresponding angles
• alternate interior angles
• alternate exterior angles
• same side interior angles
• same side exterior angles.
21. Alternate Exterior
Angles 1 2
3
4
6
7
8
5
- are two non-
adjacent exterior
angles in the
opposite sides of
the transversal.
- Congruent angles
22. Same Side Interior
Angles 1 2
3
4
6
7
8
5
- are angles that
are formed in the
inner part of the
same side of the
transversal.
- Supplementary angles
23. Same Side Exterior
Angles
- are angles that
are formed in the
outer part of the
same side of the
transversal.
1 2
3
4
6
7
8
5
- Supplementary angles
38. Generalization
• When can we say that two lines are parallel to each
other?
• What do you call a line that intersects two or more
lines?
• How about the angles in the inner part of the parallel
lines cut by a transversal?
• How about the Outer part of it?