1. Materials: Lesson 16.1 excel spreadsheet handout
Points, Lines and Line Segments Vocabulary: line segment, endpoints, parallel, intersection and perpendicular
Materials: Lesson 16.1 excel spreadsheet handout

2. Lines
A line is straight and continues in both directions. It has no endpoints.

3. Line segment and endpoints
A line segment is a piece of a line. It has two endpoints.
What it actually is:
line segment D E
Write: DE or ED

4. Where do you see line segments in these pictures?

5. parallel “is parallel to” What it actually is: Y parallel Z K L
Write: YZ KL L
“is parallel to”

6. Where do you see parallel lines in these pictures?

7. These lines intersect at point J.
intersecting lines
What it actually is:
Lines that cross each other. J
These lines intersect at point J.

8. Place a point at each intersection.

9. The angle makes a square corner, which is called a right angle.
perpendicular
The angle makes a square corner, which is called a right angle.
What it actually is:
Two lines that form right angles.

10. What it actually is:
An angle that makes a square corner
right angle

11. Do you see any right angles?
Use the RED pen to show parallel lines.
Use the BLUE pen to show perpendicular lines.
Place a GREEN point on intersecting lines.