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# 1.2 Measuring Segments and angles - PowerPoint PPT Presentation

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

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.

• Questions?

• 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.

• 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

• 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

• 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.)

• 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.

• Do # 1 – 5 independently

• Skip #6

• If you’re done, try # 7 – 14

• 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.