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

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
• Questions?
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?
• 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
• 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
• 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 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
• Do # 1 – 5 independently
• Skip #6
• If you’re done, try # 7 – 14
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.