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# Geometry Terms - 5th Grade

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### Geometry Terms - 5th Grade

1. 1. Chapter 23 Lesson 1 Geometry
2. 2. Point <ul><li>A point marks an exact location in space. Use a letter to name a point. </li></ul>
3. 3. Line <ul><li>A line is an endless straight path. It has no endpoints. Use two points on the line to name the line. </li></ul>
4. 4. Line Segment <ul><li>A line segment is part of a line between two endpoints. Use the two endpoints to name the line segment. </li></ul>
5. 5. Ray <ul><li>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. </li></ul>
6. 6. Plane <ul><li>A plane is an endless flat surface. Use three points that are not on a line to name the plane </li></ul>
7. 7. Angle <ul><li>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. </li></ul>
8. 8. Right Angle <ul><li>A right angle measures 90° </li></ul>
9. 9. Acute Angle <ul><li>An acute angle is greater than 0 and less than 90° </li></ul>
10. 10. Obtuse Angle <ul><li>An obtuse angle is greater than 90 and less than 180° </li></ul>
11. 11. Straight Angle <ul><li>A straight angle measures 180° </li></ul>
12. 12. Intersecting Lines <ul><li>Intersecting lines are lines that cross at one point. </li></ul>
13. 13. Parallel Lines <ul><li>Parallel lines are lines in a plane that never intersect and are the same distance apart at every point. </li></ul>
14. 14. Perpendicular Lines <ul><li>Perpendicular lines are lines that intersect to form four right angles. </li></ul>