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Warm-up

Warm-up. If F lies between points E and G, mEF =3 cm. and mEG =38cm. What is mFG ? Objective: TLW measure and classify angles and add angle measures. 1.5: Measuring Angles. Obj : Use a protractor to measure angles and name angles. Other Geometric Figures.

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Warm-up

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  1. Warm-up • If F lies between points E and G, mEF=3 cm. and mEG=38cm. What is mFG? • Objective:TLW measure and classify angles and add angle measures

  2. 1.5: Measuring Angles Obj: Use a protractor to measure angles and name angles.

  3. Other Geometric Figures • Angle: a figure formed by 2 rays with a common endpoint. • Vertex of the angle: The common endpoint • Sides of the angle: the rays

  4. Ex: Identify the vertex of the angle below and name its sides. Vertex__________ Sides ________ ----------- A R C

  5. Angles • Naming an angle (3 ways) • < with the name of the vertex • < with a point from one side, the vertex, and a point from the other side • < with a number shown in the interior

  6. Example B G 3 L Possible Names H

  7. Examples

  8. Using a Protractor to Measure Angles • Line arrow of protractor with vertex of angle • Place edge of protractor on one ray of angle • Determine which #’s to use (ray is on 0) • Find degree measure where other ray intersects the protractor

  9. Ex: Measure the angles

  10. Definitions • Congruent Angles: Angles with the same degree measure • Ex: • Note: To indicate that angles are congruent in a pic use arcs on the angles 80° 80°

  11. Types of Angles • Acute: 0-90 degrees • Right: 90 degrees • Obtuse: 90-180 degrees • Straight: 180 degrees

  12. Angle Addition Postulate • If point S is in the interior of < PQR, then m < PQS + m < SQR = m < PQR R Q S P

  13. Example

  14. Guided Practice

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