2. Angles have two rays that share a common endpoint called the vertex. vertex rays (vertices)

3. Angles are measured in degrees. One degree is equal to th of a circle. 1 360 The minute hand of a clock rotates 360° each hour.

4. Angles can be classified according to their measure.

5. Classify the angles as acute, obtuse, right, or straight.

6. Refer to the flag of Nepal shown below to classify and measure the angles. Classify each angle: 5.angle A ___________ 6.angle B ___________ 7.angle C ___________

7. 8. – 10. D raw or attach a picture of a real-life example of each type angle. 8. acute9.obtuse 10. right11. straight

8. Angle relationships Supplementary angles The sum of the measure of supplementary angles always equals 180° Name some pairs of supplementary angles in the diagram.

9. Complementary angles The sum of the measure of complimentary angles always equals 90° Name some pairs of complimentary angles in the diagram. j k

10. Vertical angles Vertical angles are congruent angles that share a vertex but do not share a side…. they are “across” from each other. Name some pairs of vertical angles.

11. Adjacent angles Adjacent angles are angles that are “side- by-side”…they share a common vertex and a common side. Name some pairs of adjacent angles.

12. Identify angle relationships 1. a & d 2. e & f 3. g & f 4. c & d