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M217 Section 1.3

M217 Section 1.3. Measuring Angles. 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. Angle Measures, Congruency.

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M217 Section 1.3

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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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