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Questions and Answers
What defines a straight line in geometry?
What defines a straight line in geometry?
- A straight line is determined by one point.
- A straight line is a collection of infinitely many points in a single direction.
- A straight line must have at least three distinct points.
- A straight line is defined by two points. (correct)
How is a line segment represented in notation?
How is a line segment represented in notation?
- As $ar{AB}$ or line AB (correct)
- As line AB only
- As a straight line with arrows on both ends
- As $ackslash$ AB
What indicates that a line extends infinitely in both directions?
What indicates that a line extends infinitely in both directions?
- The absence of endpoints
- A dashed line segment
- Points labeled at both ends
- Arrowheads at both ends (correct)
Which statement correctly describes a ray?
Which statement correctly describes a ray?
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What are the endpoints of a line segment?
What are the endpoints of a line segment?
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Study Notes
Straight Line Basics
- A straight line is defined by two points and extends infinitely in both directions.
- Arrowheads at the ends of a line indicate its infinite nature.
- A line can be named using a small letter (e.g., line D) or by two points on the line (e.g., line AB, line BA).
- A line is denoted using the symbol $\overleftrightarrow{AB}$ or $\overleftrightarrow{BA}$.
Parts of a Line
- Line Segment: A portion of a straight line with a defined start and end point.
- Endpoints: The two points that define the boundaries of a line segment.
- Ray: Part of a straight line with a single endpoint that extends infinitely in one direction.
- A ray is denoted by $\overrightarrow{AB}$, indicating an arrow starting at point A and extending towards point B.
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