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Theorem : The angle subtended by an arc at the centre is double the angle subtended by it at any point on the remaining part of the circle.

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Theorem : Angles in the same segment of a circle are equal.

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Theorem : If a line segment joining two points subtends equal angles at two other points lying on the same side of the line containing the line segment, the four points lie on a circle (i.e. they are concyclic).

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Theorem :- The angle subtended by an arc at the centre is double the angle subtended by it at any point on the remaining part of the circle

Theorem :- Angles in the same segment of a circle are equal

Theorem :- If a line segment joining two points subtends equal angles at two other points lying on the same side of the line containing the line segment, the four points lie on a circle (i.e. they are concyclic)