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# Geometry Terms - 5th Grade

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### Transcript

• 1. Chapter 23 Lesson 1 Geometry
• 2. Point
• A point marks an exact location in space. Use a letter to name a point.
• 3. Line
• A line is an endless straight path. It has no endpoints. Use two points on the line to name the line.
• 4. Line Segment
• A line segment is part of a line between two endpoints. Use the two endpoints to name the line segment.
• 5. Ray
• A ray is part of a line that has one endpoint and goes on forever in one direction. Use an endpoint and one other point on the ray to name a ray.
• 6. Plane
• A plane is an endless flat surface. Use three points that are not on a line to name the plane
• 7. Angle
• An angle is formed by two rays with the same endpoint. An angle can be named by three letters – a point from each side and the vertex as the middle letter. It can also be named by a single letter, its vertex.
• 8. Right Angle
• A right angle measures 90°
• 9. Acute Angle
• An acute angle is greater than 0 and less than 90°
• 10. Obtuse Angle
• An obtuse angle is greater than 90 and less than 180°
• 11. Straight Angle
• A straight angle measures 180°
• 12. Intersecting Lines
• Intersecting lines are lines that cross at one point.
• 13. Parallel Lines
• Parallel lines are lines in a plane that never intersect and are the same distance apart at every point.
• 14. Perpendicular Lines
• Perpendicular lines are lines that intersect to form four right angles.