Measuring Angles Using Protractor (modified, up to 180 deg)
- txywishes, Anthony OR 柯志明
(Updated: 8 Sept 2016) Measure the angle using the protractor. Drag the protractor to appropriate position. Drag the red point to rotate it. Drag the green points or press the "Random" button to adjust the angle.
Anthony Or. GeoGebra Institute of Hong Kong.