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The angle subtended by an arc at the centre is twice the angle at the circumference

The angle in a semicircle is a right angle

The perpendicular bisector of a chord is a radius

A radius and a tangent are perpendicular

Two tangents from a circle to the same point outside of a circle are equal length

Opposite angles in a cyclic quadrilateral add up to 180

Angles at the circumference subtended by the same arc are equal

Alternate Segment Theorem

Intersecting Chord Theorem

External Intersecting Chord Theorem
