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

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

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

Where do you see line segments in these pictures?

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

Where do you see parallel lines in these pictures?

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

Place a point at each intersection.

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.

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

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.