Angles and Parallel Lines

1
Angles and Parallel Lines

• Section 3-2

2
Corresponding Angles Postulate

• If 2 parallel lines are cut by a transversal,
  then corresponding angles are congruent.

1
2
3
4
6
5
7
8
3
Alternate Interior Angle Thm.

• If 2 parallel lines are cut by a transversal,
  then alternate interior angles are congruent.

100
80
80
100
4
Alternate Exterior Angle Thm.

• If 2 parallel lines are cut by a transversal,
  then alternate exterior angles are congruent.

110
70
70
110
5
Consecutive Interior Angles Thm.

• If 2 parallel lines are cut by a transversal,
  then consecutive interior angles are
  supplementary.

120
60
60
120
6
Perpendicular Transversal Thm.

• If a transversal is perpendicular to one of 2
  parallel lines, then it is perpendicular to the
  other one also.

7
Joke Time

• How many lemons grow on a lemon tree?
• All of them

8

• What did Leonardo da Vincis cow paint?
• The MOOna Lisa!