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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1.2 Measuring Segments and angles

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1 2 measuring segments and angles

1.2 Measuring Segments and angles


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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