Concept 4 of 8Foundation
Watch on YouTubeVideoMeasuring angles with a protractor
Steps:
- Place protractor's centre on the vertex.
- Align baseline with one arm of the angle.
- Read the scale where the other arm crosses.
Most protractors have TWO scales (0° from left and 0° from right) — choose the scale that starts at 0° on your aligned arm.
Example
Your angle's arm aligns with 0° on the inner scale. Other arm crosses at 125° on inner scale → angle is 125°.
💡 Tip:If your answer looks obtuse but protractor says acute (or vice versa), you read the wrong scale.
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5 questions to check what you just read.
0 / 5
- Q1.Centre of the protractor goes on the:
- Q2.If one arm lines up at 0° on inner scale, read the other arm on:
- Q3.A protractor typically shows angles from 0° to:
- Q4.To measure a reflex angle (>180°), use:
- Q5.If you read an obtuse angle as acute, you likely: