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Lines, Line Segments, & Rays
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What you will learn from this videoWhat you will learn
- We’ll learn about lines, line segments, and rays.
- We'll also learn the difference between parallel and perpendicular lines.
- And we’ll discover that this knowledge can help us build a bird house, travel on a train, and understand a blueprint!
- Discussion Questions
Before Video
What comes to mind when you hear the word “point”?ANSWERShowing where something is; earning credit for getting something right; a dot; a mark on a line plot or other data display.
Rectangular tabletops, floors, or walls; circular clock; triangular pennants.
The top and bottom of a brick; the top of one wall and the bottom of another.
Any closed shape with 4 straight sides, where the sides do not connect at all 90-degree angles is correct.
Students may point out the corners of their desk, or of the floor tiles.
After Video
You use the word "line" in your daily life and in math. How are the ways you use the word different? ANSWERIn daily life, lines may be curved or stop, but as a mathematical object lines need to be straight and go on forever.
The sides have a starting point and an ending point. They are line segments.
Sides of rectangular objects; sides of triangles that meet at a 90-degree angle.
For example, a square has 2 pairs of parallel sides and 4 pairs of perpendicular sides.
Yes, as long as they cross somewhere so they share a point, rays or lines could form angles.
- Vocabulary
- Point DEFINE
A location with no length or width, often shown as a dot.
- Line segment (or Segment) DEFINE
A straight connection between two points; a portion of a line.
- Line DEFINE
A straight object that goes on forever in two directions; it has a length, but no width.
- Ray DEFINE
A straight object that starts at a point and goes on forever in one direction, shown by an arrow.
- Parallel DEFINE
Two lines that always stay the same distance apart.
- Perpendicular DEFINE
Two lines that intersect at a 90-degree angle.
- Point DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide