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2-19-14 February 19, 2014 February 19, 2014 1- Fill in your planner 2- Take a MM 3- Return any graded work 4- If you have a make up test you will be taking it. 5- Lesson 8-2 Classifying angles 2-19-14 February 19, 2014 2-19-14 February 19, 2014 8.2 Classifying Angles Warm Up Draw each figure. 1. line segment 2. line 3. ray 4. plane 2-19-14 February 19, 2014 8.2 Classifying Angles Learn to identify angles and angle pairs. Vocabulary... An angle is formed by two rays with a common endpoint. The two rays are the sides of the angle. The common endpoint is the vertex. Angles are measured in degrees (°). 2-19-14 February 19, 2014 Vocabulary... An angle’s measure determines the type of angle it is. A right angle is an angle that that measures exactly 90°. The symbol indicates a right angle. An acute angle is an angle that measures less than 90°. An obtuse angle is an angle that measures more than 90° but less than180°. A straight angle is an angle that measures 180°. 2-19-14 February 19, 2014 Example 1: Classifying Angles Tell whether each angle is acute, right, obtuse or straight. 2-19-14 February 19, 2014 Check It Out: Example 1 Tell whether each angle is acute, right, obtuse, or straight. 2-19-14 February 19, 2014 More Vocabulary... If the sum of the measures of two angles is 90°, then the angles are complementary angles. If the sum of the measures of two angles is 180°, then the angles are supplementary angles. 2-19-14 February 19, 2014 Example 2A: Identifying Complementary and Supplementary Angles Use the diagram to tell whether the angles are complementary, supplementary, or neither. OMP and PMQ 2-19-14 February 19, 2014 Example 2B: Identifying Complementary and Supplementary Angles Use the diagram to tell whether the angles are complementary, supplementary, or neither. NMO and OMR 2-19-14 February 19, 2014 Calculate the value of x x o 60 2-19-14 February 19, 2014 Calculate the value of x o 20 5x 2-19-14 February 19, 2014 Calculate the value of x o 95 4x + 5 2-19-14 February 19, 2014 2-19-14 February 19, 2014 2-19-14 February 19, 2014 Example 2C: Identifying Complementary and Supplementary Angles Use the diagram to tell whether the angles are complementary, supplementary, or neither. PMQ and QMR 2-19-14 February 19, 2014 Angle song 2-19-14 February 19, 2014 Lesson Quiz: Part I Tell whether each angle is acute, right, obtuse, or straight. 2-19-14 February 19, 2014 Practice with measuring angles using a protractor. 2-19-14 February 19, 2014 Lesson Quiz: Part II Use the diagram to tell whether the angles are complementary, supplementary, or neither. 3. AZB and BZC 5. Angles M and N are supplementary. If what is N? 4. BZC and M is 117°, CZD