1. Geometry Vocabulary Lesson #3

2. #12 Angle A figure formed by 2 rays with the same endpoint

3. #13 Degree #13 Degree The unit used to measure angles 45º

4. # 14 Vertex The point where rays or 2 sides of a figure meet The point where rays or 2 sides of a figure meet

5. #15 Acute Angle #15 Acute Angle An angle that measures less than 90º

6. #16 Obtuse Angle An angle that measures more than 90º but less than 180º An angle that measures more than 90º but less than 180º

7. #17 Right Angle An angle that measures exactly 90º

8. #18 Straight Angle #18 Straight Angle An angle that measures exactly 180º

9. #19 Complementary Angle 2 angles that add up to 90º

10. #20 Supplementary Angles 2 angles that add up to 180º 2 angles that add up to 180º