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Classifying and Measuring Angles

Classifying and Measuring Angles. Lesson 7-2. Angles. An angle is made up of 2 rays with a common end point. Angles are measured in units called degrees. Vertex- the point where the 2 rays meet. Naming Angles. C. You can use the symbol to name the angle. 2. B.

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Classifying and Measuring Angles

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  1. Classifying and Measuring Angles Lesson 7-2

  2. Angles • An angle is made up of 2 rays with a common end point. • Angles are measured in units called degrees. Vertex- the point where the 2 rays meet.

  3. Naming Angles C You can use the symbol to name the angle. 2 B ABC or CBA Always use the vertex as the middle letter. A B Use the vertex only 2 Use a number

  4. Types of Angles Acute Angle Right Angle Measure less than 90 Measure exactly 90 Straight Angle Obtuse Angle Measure between 90 and 180 Measure exactly 180

  5. With your arms show me….. Obtuse acute straight Right

  6. Pairs of Angles Adjacent Angles Complimentary Angles 51 39 Share a vertex and one side Sum of two angles is 90 Vertical Angles Supplementary Angles X A B Y 140 40 Opposite angles when two lines cross. Sum of two angles is 180

  7. Find the measure of an angle P ? 95 M R N

  8. The outer scale goes from 0 to 180 from left to right. Protractor The inner scale goes from 0 to 180 from right to left.

  9. How to measure an angle If the ray passes through this zero, use the inner scale. If the ray passes through this zero, use the outer scale. Lay one of the rays of the angle on the line passing through zero. Line up the vertex of the angle with the center of the protractor.

  10. Measure this angle from the inner scale. • This angle measures 75

  11. Measure this angle from the outer scale. • This angle measures 100

  12. Draw an Angle that measures 60 First draw a ray. Next lay the protractor on top of the ray with the end point at the center of the ray.

  13. Draw an Angle that measures 60 Then draw the other ray passing it through this point. Mark the point on the protractor that you want the other ray to pass through.

  14. Draw an Angle that measures 60

  15. Show your partner how to use a protractor to measure an angle

  16. Don’t forget • Complete pages 293-294 1-32

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