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Understanding Angle Terminology and Measures

Learn about angle terminology including vertex and sides, measuring angles with a protractor, angle bisectors, and angle addition postulate. Understand angle classifications based on measure, congruency, and interior and exterior points.

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Understanding Angle Terminology and Measures

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  1. M217 Section 1.3 Measuring Angles

  2. Angle Terminology: C I • Angle: 2 different rays with the same endpoint • Vertex: Common endpoint - A • Sides: Two rays – • Naming: • Interior: • Exterior: • On: 2 A B E

  3. Angle Measures, Congruency • Angles are measured using a protractor • If two angles have the same measure, then they are congruent angles and are marked with arcs • the

  4. Classifying Angles by Measure

  5. Angle Addition Postulate • If P is on the interior of angle RST, then • Basically: two parts = 1 whole

  6. T is on the interior of angle PQR

  7. Defn: Angle Bisector • An Angle Bisector is a ray that divides an angle into two congruent angles

  8. Angle Bisector

  9. Reading a Protractor • Notice two sets of numbers • Now try #4 – 6 on page 24. Then begin HW 4. 15◦, acute 5. 105◦, obtuse 6. 110◦, obtuse

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