The angle in a semicircle is 90º, The angle at the centre is double the angle at the circumference, The angles in the same segment from a common chord are equal, The opposite angles in a cyclic quadrilateral add to 180º, The angle between the radius and a tangent is 90º, Alternate Segment Theorem The angle between the chord and the tangent is equal to the opposite angle inside the triangle, The tangents to a circle from the same point will be equal length, The radius through the midpoint of a chord will bisect the chord at 90º,

Circle Theorems

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