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Measuring Angles with Protractors
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Measuring Angles with Protractors
Help Aria check the angles on a mini-golf course. Use the angle diagrams and your protractor where asked. Angles are measured in degrees (°).
Warm up: turns and angle types
1.Aria turns to face the next hole. How many degrees are in one full turn?
- 90°
- 180°
- 270°
- 360°
2.A path bends through a right angle. How many degrees is that?
3.A narrow gate swings open to 45°. Is this angle acute, right, or obtuse?
- Acute
- Right
- Obtuse
4.The turning arrow points halfway around a circle. Write the size of a half turn.
Set up your protractor
To measure an angle, place the protractor’s centre point exactly on the angle’s vertex. Line up its baseline with one arm, then read where the other arm crosses the scale.
5.Where should the protractor’s centre point sit?
6.A protractor is centred on the vertex, but its baseline is not lined up with either arm. What should you fix before reading the scale?
Measure and reason
7.Measure the angle shown with a protractor. Record the angle in degrees.
8.An angle measures 120°. Is it acute, right, or obtuse? Explain how you know.
9.The mini-golf gate opens to 90°. It turns a further 35°. What is its new angle?
10.Draw two arms that make an angle of about 45°. Then label the vertex.
3 printable pages
Page 1
Page 2
Page 3
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