Measure turns in degrees
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Log in to continueEstimate, construct and check angles using the correct protractor scale.
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Name the marked angle between the baseline and the other ray.
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A dual-scale protractor. The baseline ray points right; the other ray is 18° anticlockwise from a right baseline or clockwise from a left baseline.
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Answer: Acute
- Compare the opening with a right angle of 90°.
- 18° is acute.
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Curriculum reference
Victorian Curriculum F–10 Version 2.0
Pi Leo practice scope
Estimate, construct and check angles using the correct protractor scale.
Read the official VCAA curriculum description (VC2M5M04)
These quizzes practise concepts within this topic. Multiple-choice answers alone do not demonstrate drawing, conducting an investigation or using a digital tool.
Activities to practise beyond the quiz
- Supported by the guided activity; selecting an MCQ does not demonstrate this action.
- VC2M5M04-C01Compare the opening with a quarter-turn (90°), a half-turn (180°) and a full turn (360°). The lengths of the arms do not change the angle.
- VC2M5M04-C02Put the centre of the protractor on the vertex and line up its baseline with one arm. Start with the scale whose zero lies on that arm. Read where the second arm crosses it.
- VC2M5M04-C03Draw the first arm. Place the protractor centre on the vertex. Start at zero on that arm and mark the desired angle. Join the vertex to the mark, then measure again to check.
- VC2M5M04-C04Estimating, physically constructing and measuring angles with tools.
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Subskills
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Descriptor-derived subskills
- D01Recognise angle namesCompare the opening with a quarter-turn (90°), a half-turn (180°) and a full turn (360°). The lengths of the arms do not change the angle.
- D02Read the correct protractor scalePut the centre of the protractor on the vertex and line up its baseline with one arm. Start with the scale whose zero lies on that arm. Read where the second arm crosses it.
- D03Construct and check an angleDraw the first arm. Place the protractor centre on the vertex. Start at zero on that arm and mark the desired angle. Join the vertex to the mark, then measure again to check.