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Using Protractors Worksheet
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Using Protractors Worksheet
Use a protractor to measure or draw angles. When measuring, place the centre on the vertex, line up one arm with 0°, and read the scale that starts at 0° on that arm. Give all measurements in degrees (°).
Read the angle
A maker is checking the corners of a model bridge. Use angle facts and the diagrams to help.
1.Which angle measures exactly 90°?
- Acute angle
- Right angle
- Obtuse angle
- Reflex angle
2.Which statement describes the size of an acute angle?
- Less than 90°
- Exactly 90°
- More than 90° but less than 180°
- More than 180°
3.Look at the angle shown. What is its measure, and what type of angle is it?
4.A bridge brace makes the angle shown. Is it acute, 90°, or obtuse?
5.Complete the rule: an obtuse angle is greater than ° and less than °.
6.True or false? A reflex angle is greater than 180° and less than 360°.
TrueFalse
Measure and make angles
Measure carefully: the centre of the protractor belongs exactly on the vertex, and one arm must line up with the baseline.
7.Measure the angle shown. Write its size and say whether it is acute, 90°, or obtuse.
8.Draw an angle of 60° using a protractor. Label the angle 60° and mark its vertex.
9.Draw an angle measuring 90° using a protractor. Add a small square at the vertex to show its measure.
10.Explain why you must choose the scale that begins at 0° on the arm lined up with the protractor's baseline.
11.A student measures an angle but places the protractor's centre slightly away from the vertex. Explain what could go wrong.
2 printable pages
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