1. Unit 5 – Geometry Basic Vocabulary Lesson 1 Vocabulary

2. Unit 4 : Lesson 1 Definitions 1. Point: a specific location in space often represented by a dot. Ex. point A. A ∙

3. Unit 4 : Lesson 1 Definitions 2. Line: a set of points whose length goes on forever in 2 opposite directions. Ex. Line AB and Line GH.

4. Unit 4 : Lesson 1 Definitions 3. Line segment: the part of a line between two points on a line. __ Ex. Line segment AB or AB.

5. Unit 4 : Lesson 1 Definitions 4. Endpoints: the points at the end of a line segment or a ray. Ex. Point A and Point B are endpoints for line segment AB.

6. Unit 4 : Lesson 1 Definitions 5. Ray: a part of a line that begins at an endpoint and goes on forever in one direction. → Ex. Ray MN or MN.

7. Unit 4 : Lesson 1 Definitions 6. Angle: a figure formed by 2 distinct rays with a common endpoint called the vertex. Ex. Angle BAC or CAB.

8. Unit 4 : Lesson 1 Definitions 7. Plane: a flat surface that has no edges or boundaries that goes on forever in all directions. Ex. Plane ABCD.

9. Unit 4 : Lesson 1 Definitions 8. Intersection: the point at which two or more lines intersect or cross. Ex. Line AE and Line CD intersect at point B.

10. Unit 4 : Lesson 1 Definitions 9. Perpendicular lines: lines that meet to form right angles. Ex. Line AB and Line CD are perpendicular lines.

11. Unit 4 : Lesson 1 Definitions 10. Parallel lines: lines that lie in the same plane that do not intersect. Ex. Line AB and Line CD are parallel lines.

12. Unit 4 : Lesson 1 Definitions 11. Bisector: a line or ray that divides a segment or angle into 2 equal parts. Ex. Ray BR bisects Angle BCA

13. Unit 4 : Lesson 1 Definitions 12. Congruent: figures that have the same size, shape, and measure. Ex. Angle RSW and Angle TSW are congruent.