1 2 measuring segments and angles
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1.2 Measuring Segments and angles. Do Now. 1. Draw three non-collinear points A, B and C. 2. Draw a line through A and C and name it. 3. Draw a line segment through B and C and name it. 4. Draw a 4 th point that is collinear to A and C. Homework. Review answers Questions?.

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do now
Do Now

1. Draw three non-collinear points A, B and C.

2. Draw a line through A and C and name it.

3. Draw a line segment through B and C and name it.

4. Draw a 4th point that is collinear to A and C.

homework
Homework
  • Review answers
  • Questions?
measuring line segments
Measuring Line Segments
  • Use a ruler.
  • Measure in centimeters to get a more precise measurement.
  • On your worksheet (# 1 – 3)
    • 1. Name each line segment.
    • 2. Use your ruler to measure each line segment in centimeters.
what is an angle
What is an angle?
  • An angle is made up of two rays that are joined at a vertex.
  • Angles are named
    • Using a lowercase or Greek letter (example: a, b, θ)
    • Using the three letters on the shape that define the angle, with the middle letter as the vertex. (example: <ABC)

Vertex

classifications of angles
Classifications of Angles
  • Straight angle
    • A straight line
    • Measures 180 degrees
  • Right angle
    • Measures 90 degrees
  • Acute angle
    • Measures less than 90 degrees
  • Obtuse angle
    • Measures less than 180 degrees but more than 90 degrees
measuring angles
Measuring Angles
  • Use a protractor.
  • Line the flat edge of the protractor up against one of the rays.
  • Make sure the center of the protractor is on the vertex.
  • (Extend the length of the rays with a ruler if necessary.)
measuring angles1
Measuring Angles
  • On your worksheet (# 4 – 7)
  • Measure each of the angles to the nearest degree
  • Extend the rays with your ruler if you need to in order to read the protractor.
practice 1 3
Practice 1.3
  • Do # 1 – 5 independently
  • Skip #6
  • If you’re done, try # 7 – 14
create your own angles
Create your own angles
  • On a separate sheet of paper, draw 4 angles.
    • 2 acute
    • 2 obtuse
  • Switch with a partner.
  • Measure your partner’s angles to make sure they are correct.
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