1. 7-4 Classifying Lines Warm Up Problem of the Day Lesson Presentation
Course 1
Warm Up
Problem of the Day
Lesson Presentation

2. 7-4 Classifying Lines Warm Up
Course 1
7-4
Classifying Lines
Warm Up
Give the complement and supplement of each angle.
1. 80°
2. 64°
3. 15°
10°, 100°
26°, 116°
75°, 165°

3. 7-4 Classifying Lines Problem of the Day
Course 1
7-4
Classifying Lines
Problem of the Day
Draw three points that are not in a straight line. Label them A, B, and C. How many different lines can you draw that contains two of the points? Name the lines.
3; AB, AC, BC

4. 7-4 Classifying Lines Learn to classify the different types of lines.
Course 1
7-4
Classifying Lines
Learn to classify the different types of lines.

5. Insert Lesson Title Here
Course 1
7-4
Classifying Lines
Insert Lesson Title Here
Vocabulary
parallel lines
perpendicular lines
skew lines

6. 7-4 Classifying Lines Y W Z X
Course 1
7-4
Classifying Lines Y W Z X
Intersecting lines are lines that cross at one common point.
Line YZ intersects line WX.
YZ intersects WX. B A M L
Parallel lines are lines in the same plane that never intersect.
Line AB is parallel to line ML.
AB ML.

7. 7-4 Classifying Lines Writing Math
Course 1
7-4
Classifying Lines S R T U
Perpendicular lines intersect to form 90° angles, or right angles.
Line RS is perpendicular to line TU.
RS TU.
Writing Math
The square inside a right angle shows that the rays of the angle are perpendicular.

8. Course 1
7-4
Classifying Lines
Skew lines are lines that lie in different planes. They are neither parallel nor intersecting.
Line AB and line ML are skew.
AB and ML are skew. M L A B

9. Additional Example 1A: Classifying Pairs of Lines
Course 1
7-4
Classifying Lines
Additional Example 1A: Classifying Pairs of Lines
Classify each pair of lines. A.
The lines intersect to form right angles.
They are perpendicular.

10. Additional Example 1B: Classifying Pairs of Lines
Course 1
7-4
Classifying Lines
Additional Example 1B: Classifying Pairs of Lines
Classify each pair of lines. B.
The lines are in different planes and are not parallel or intersecting.
They are skew.

11. Additional Example 1C: Classifying Pairs of Lines
Course 1
7-4
Classifying Lines
Additional Example 1C: Classifying Pairs of Lines
Classify each pair of lines. C.
The lines are in the same plane. They do not appear to intersect.
They are parallel.

12. Additional Example 1D: Classifying Pairs of Lines
Course 1
7-4
Classifying Lines
Additional Example 1D: Classifying Pairs of Lines
Classify each pair of lines. D.
The lines cross at one common point.
They are intersecting.

13. 7-4 Classifying Lines Try This: Example 1A
Course 1
7-4
Classifying Lines
Try This: Example 1A
Classify each pair of lines. A.
The lines are in the same plane. They do not appear to intersect.
They are parallel.

14. 7-4 Classifying Lines Try This: Example 1B
Course 1
7-4
Classifying Lines
Try This: Example 1B
Classify each pair of lines. B.
The lines intersect to form right angles.
They are perpendicular.

15. Try This: Additional Example 1C
Course 1
7-4
Classifying Lines
Try This: Additional Example 1C
Classify each pair of lines. C.
The lines are in different planes and are not parallel or intersecting.
They are skew.

16. Try This: Additional Example 1D
Course 1
7-4
Classifying Lines
Try This: Additional Example 1D
Classify each pair of lines. D.
The lines cross at one common point.
They are intersecting.

17. Additional Example 2: Application
Course 1
7-4
Classifying Lines
Additional Example 2: Application
The handrails on an escalator are in the same plane. What type of line relationship do they represent?
The handrails are in the same plane and do not intersect.
The lines are parallel.

18. 7-4 Classifying Lines Try This: Example 2
Course 1
7-4
Classifying Lines
Try This: Example 2
The roads are in the same plane. What type of line relationship do they represent?
The lines cross at one common point.
The lines are intersecting.

19. Insert Lesson Title Here
Course 1
7-4
Classifying Lines
Insert Lesson Title Here
Lesson Quiz
1. Sketch a pair of perpendicular lines.
2. Sketch a pair of parallel lines.
Use the figure to classify the lines.
3. AD and BC
4. AD and CF
5. AB and BG
parallel
skew
perpendicular