Grade 6 Lines and Angles Introduction

 

🟦 Line Segment $\overline{AB}$

• The Look: It starts at dot A and stops at dot B.
• The Memory Trick: Like a piece of string cut at both ends.
• Fact: You can measure it with a ruler.

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🟥 Line $AB$

• The Look: It passes through dots A and B, but it has arrows on the tips.
• The Memory Trick: The arrows mean "Don't stop! Keep going!"
• Fact: It has no length because it is infinite.

To help you visualize these, think of a Line Segment as a stick with two ends and a Line as a never-ending beam of light.

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The Ray

There is also a Ray. It has one starting dot, but the other side is an arrow. Think of a flashlight beam! 🔦

A Ray is like a mix between a line segment and a line. It has a starting point but no ending point.

🔦 The Ray \(\vec{AB}\)

• The Look: It starts at a solid dot (A) and goes forever in one direction (shown by the arrow).
• The Rule: It has only one end point.
• Real-life example: Think of a sunray or a flashlight. The light starts at the sun or the bulb and travels forever into space!