📐 Angle Reader
I can measure and classify angles.
Audio is unavailable on this device.
📖 Learn first
Place the protractor centre on the vertex and the 0 line on one arm, then read the scale. Acute < 90°, right = 90°, obtuse between 90° and 180°.
Example: Angles on a line: one is 130°
- 180 − 130
- = 50°
Questions get harder as you go. The last ones ask you to type the answer.
