Measuring Angles with a Protractor
by Anonymous
Read the protractor scale whose 0 touches a side, then open an angle to watch it turn from acute to right to obtuse.
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About this app
Measuring Angles with a Protractor is an interactive primary maths app for learning how to read the correct scale on a protractor. Children practise identifying the scale that starts at 0 on the aligned arm, then explore how angles change between acute, right, and obtuse. A final activity shows how equal angle pieces combine to make 90°, 180°, and 360°.
Use cases
- Primary school students learning to measure angles
- Teachers demonstrating protractor scales and angle types
- Parents practising angle vocabulary and measurement with children
- Learners reviewing angle addition and full turns
Features
- Four missions for choosing the correct inner or outer protractor scale
- Practice reading angles aligned to the left or right 0
- Interactive angle builder with small and large adjustments
- Visual classification of zero, acute, right, obtuse, and straight angles
- Angle-piece activities for making 90°, 180°, and 360°
- Examples showing 45° × 4, 60° × 3, and 90° × 2 equal 180°