The embed below shows all 7 circle theorems. Circle theorems are a set of rules that define how circle behave and are incredibly useful to geometrical mathematics.
- First circle theorem - The angle subtended by a chord at the centre is twice the size of the angle subtended by the same chord at the circumference.
- Second circle theorem - The angles subtended by a chord in the same segment are equal.
- Third circle theorem - angles in the same segment.
- Fourth circle theorem - angles in a cyclic quadrilateral.
- Fifth circle theorem - length of tangents.
- Sixth circle theorem - angle between circle tangent and radius.
- Seventh circle theorem - alternate segment theorem.
