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1.2 Measuring Segments and anglesPowerPoint Presentation

1.2 Measuring Segments and angles

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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

- Review answers
- 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.

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