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Section 1.3: Angles

Section 1.3: Angles. Tuesday, 9/3 Wednesday, 9/4 ^^^Table of Contents. Warm-up. Draw and label a picture for the following problems. Then, solve and decide whether the picture “makes sense.” Solve (30-x)+(6x+175)=180 Draw Alternate Interior angles of (10x-7) and (7x+11) and solve. Agenda.

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Section 1.3: Angles

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  1. Section 1.3: Angles Tuesday, 9/3 Wednesday, 9/4 ^^^Table of Contents

  2. Warm-up • Draw and label a picture for the following problems. Then, solve and decide whether the picture “makes sense.” • Solve (30-x)+(6x+175)=180 • Draw Alternate Interior angles of (10x-7) and (7x+11) and solve.

  3. Agenda • Warm-up • Essential Idea: Angles are used to measure difference in direction. We need certain words to describe certain relationships.

  4. Ray The basic idea: Definition Word: Ray Examples Non Examples

  5. Labeling Angles The basic idea: Definition Word: Angle Examples Non Examples

  6. Protractor

  7. Kinds of Angles • Acute angle: an angle between 0 and 90 degrees • (Draw an example) • Right angle: a 90 degree angle • (draw an example) • Obtuse angle: An angle between 90 and 180 degrees. • (draw an example) • Straight angle: Formed by two opposite rays and measures 180 degrees • (draw a picture)

  8. Practice with Protractors

  9. Angle Bisector The basic idea: Definition Word: Angle Bisector Examples Non Examples

  10. Assignment • Get out assignment log • Ask questions about assignment • New Assignment: • Section 1.3 #1-10 on page 24 • I will collect your notebook at the end of class, so this will have to be done on a separate paper.

  11. Quiz Time • Take your time. Use your notes. • I will give ½ a point extra credit for each problem where you explain whether the picture makes sense or doesn’t make sense. • I will collect and grade your notebook at the end of class.

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