- Circle Geometry 2
- Circle Theorem 1 - Angle at the Centre
- Circle Theorem 2 - Angles in a Semicircle
- Circle Theorem 3 - Angles in the Same Segment
- Circle Theorem 4 - Cyclic Quadrilateral
- Circle Theorem 5 - Radius to a Tangent
- Circle Theorem 6 - Tangents from a Point to a Circle
- Circle Theorem 7 - Chords of a Circle
- Theorem 8 - Exterior angle of a cyclic quadrilateral
