Drag the purple ray around the centre point to create different angles.

The coloured sector shows the amount of turn.

Use Free Explore to investigate acute, right, obtuse, straight and reflex angles.

Use Build the Angle to create a target angle.

Use Guess the Angle to type an estimate, check how close you were, then reveal the measure.

Turn the protractor on/off and use Snap to practise common benchmark angles.