Being a teacher, you probably need tools now and then to explain stuff to kids. Here we have got a full circle with up to 360° angle. You can simply drag the orange line to move it and explain angles to kids.
Touch Display Users (including mobile or tablets users): Tap the small arrow icon that may appear below the circle or on the left. Then move the range to move the line.
Angle Explainer (Movement Tool with Full Circle)
Updated 14 November 2020