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The angle that lies between a tangent and a chord is equal to the angle subtended by the same chord in the alternate segment.
The angle at the centre is twice the angle at the circumference.
Angles in the same segment are equal
The angle in a semicircle is 90 degrees.
The angle between a tangent and radius is 90 degrees
The opposite angles in a cyclic quadrilateral total to 180.
The angle in a semicircle is 90 degrees
Tangents which meet at the same point are equal in length.