Each learning path is one chapter: a guided route through a topic, one small course at a time. Pick a class to see its chapters in order.
A wheel, a coin and the rim of a glass are all circles, and every point on them is the same distance from the centre. That one fact leads to many theorems. In this chapter you study chords and the angles they make, the four-sided figures that fit inside a circle, and the tangents that touch a circle at a single point. Python draws circles and checks each theorem on hundreds of random cases.