1. Types of Angles

2. Acute Angle Any angle that measures less than 90 o

3. Right Angle Any angle that measures exactly 90 o

4. Obtuse Angle Any angle that measures more than 90 o, but less than 180 0

5. Straight Angle Any angle that measures exactly 180 o

6. Angle Relationships The definitions we looked at earlier apply to angles when we look at one angle The definitions we looked at earlier apply to angles when we look at one angle But there are also some special relationships between pairs of angles But there are also some special relationships between pairs of angles

7. Adjacent Angles Two angles that are next to each other and share one side

8. Vertical Angles Two angles that are across from each other. They are always equal in measure.

9. Complementary Angles Two angles that add up to exactly 90 o

10. Supplementary Angles Two angles that add up to exactly 180 o

11. Practice! Can you name each angle? Obtuse Acute Vertical Supplementary Complementary

12. 180 o – 98 o = 82 o Can you find the missing angle? 90 o – 53 o = 37 o Vertical angles are equal, so x is 51 o

13. Now that you have finished your angle notes, return to the math website and start the next section Now that you have finished your angle notes, return to the math website and start the next section