Parallel Lines and Related Angles

1
Parallel Lines and Related Angles

• 7.1

2
Definitions

• Transversal a line that intersects two coplanar
  lines at two distinct points

Transversal
3
Postulate 7.2

• Alternate Interior Angles
• If two // lines are cut by a transversal then the
  alternate interior angles are congruent

4
Alternate Interior Angles

• Example 1 2 or 3 4

1
4
3
2
5
Postulate 7.3

• Same Side Interior angels
• If two // lines are cut by a transversal then the
  pairs of same side interior angles are
  supplementary

6
Same Side Interior Angles

• Example 3 4 or 1 2

1
4
2
3
7
Postulate 7.1

• Corresponding Angles
• If two // lines are cut by a transversal then the
  corresponding angles are congruent

8
Corresponding Angles

• Example 1 2 or 5 6

4
2
5
7
1
3
6
8
9
Homework

• P 366 1-14, 19-24