Google Classroom
GeoGebraGeoGebra Classroom

Using a protractor

1. Move the points A and C to vary the angles in the triangle. 2. Use the RED dot to move the protractor to any of the points A, B or C. 3. Use the BLUE dot to rotate the protractor. 4. Use the slider to change the protractor size. 5. Click on the tick boxes to check the angles.