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1.
Acute Angle: An angle whose measure is between 0 degrees and 90⁰.

2.
Acute Triangles: All angles are acute angles.

3.
Adjacent Angles: These are a pair of angles with a common vertex and a common side.

4.
Complimentary Angles: These are two angles whose measures add up to 90⁰.

5.
Congruent Angles: Angles that have the same measure.

6.
Congruent Line Segments: Line segments that are the same lenght.

7.
Equilateral Triangle: All sides are congruent.

8.
Intersecting Lines: Lines that pass through the same point.

9.
Isosceles Triangle: At least two sides are congruent.

10.
Line: This is a straight path of points that goes on forever in two directions.

11.
Line Segment: This is a part of a line with two endpoints.

12.
Midpoint: The point on a line segment that is halfway between the two endpoints.

13.
Obtuse Angle: An angle whose measure is between 90⁰ and 180⁰.

14.
Obtuse Triangle: One angle is an obtuse angle.

15.
Parallel Lines: These are lines in the same plane but do not ever intersect. ‖ is the symbol for parallel lines.

16.
Perpendicular Lines: These are intersecting lines that form a right angle. ⊥ is the symbol for perpendicular lines.

17.
Plane: This is a flat surface that extends forever in all directions.

18.
Point: This is an exact location in space.

19.
Ray: This is a part of a line, with one endpoint, extending forever in only one direction.

20.
Right Angle: An angle whose measure is exactly 90⁰.

21.
Right Triangle: One angle is a right (90⁰) angle.

22.
Scalene Triangle: No sides are congruent.

23.
Straight Angle: An angle whose measure is exactly 180⁰.

24.
Supplementary Angles: These are two angles whose measures add up to 180⁰.

25.
Transversal Line: A line that cuts across two or more lines.

26.
Vertex: This is where two different rays have the same endpoint. Where they meet an angle is formed.

27.
Vertical Angles: These are a pair of angles that are formed by intersecting lines and have no side in common.

## 6 GR Chapter 11.1 - 11.4 VocabularyStudy online at quizlet.com/_1403t |

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