25. Circle Theorems

25.1 Introduction to Circle Theorems
25.2 Angle in a Semicircle
25.3 Tangent and Radius Theorem
25.4 Angle at the Centre Theorem
25.5 Angles in the Same Segment
25.6 Cyclic Quadrilaterals
25.7 Alternate Segment Theorem
25.8 Equal Chords and the Centre
25.9 Perpendicular Bisector of a Chord
25.10 Tangents from an External Point