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Angle at circumference is half that at the centre
Bowtie rule - Angles in the same segment are equal
Opposite angles in a cyclic quadrilateral add to 180Ā°
The angle at the circumference of a semicircle is 90Ā°
The angle between a tangent and a radius is 90Ā°
The perpendicular from the centre of a circle to a chord bisects the chord.
Alternate Segment Theorem-The angle between a tangent and a chord is equal to the angle in the alternate segment.
Tangents meeting at the same point are the same length