1. Math I CAN find the measure of angles. I CAN construct angles.

2. Vocabulary Angle: Two rays with a common endpoint form an angle. The rays and the vertex are used to name the angle. Vertex: A vertex of an angle is the common endpoint of the rays forming the angle. Degree: The most common unit of measure for angles.

3. Vocabulary Acute angle—Angle that is less than 90 degrees.

4. Vocabulary Right angle—Angle that measures 90 degrees.

5. Vocabulary Obtuse angle — Angle that is greater than 90 degrees

6. Vocabulary Straight Angle – An angle that measures exactly 180˚

7. Identify the following as acute, obtuse, right, or straight. 1. 2. 3.

8. Angle Relationships Vertical Angles: Opposite angles formed by the intersection of two lines. Vertical angles have the same measure! Which angles are vertical angles?

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

10. Supplementary Angles: Two angles are supplementary if the sum of their measures is 180˚

11. Complementary Angles: Two angles are complementary if the sum of their measures is 90˚ 58 + 32 = 90˚

12. Now let’s measure angles!

13. Measure the following angle then classify it as acute, obtuse, right, or straight.