- Circle Geometry 2Circle Theorem 1 - Angle at the CentreCircle Theorem 2 - Angles in a SemicircleCircle Theorem 3 - Angles in the Same SegmentCircle Theorem 4 - Cyclic QuadrilateralCircle Theorem 5 - Radius to a TangentCircle Theorem 6 - Tangents from a Point to a CircleCircle Theorem 7 - Chords of a CircleTheorem 8 - Exterior angle of a cyclic quadrilateral
