The angle at the centre is twice the angle at the circumference, The angle at the circumference in a semi-circle is a right angle, Angles in the same segment are equal, Opposite angles in cyclic quadrilateral sum to 180o , The perpendicular from the centre of a circle to the chord bisects the chord, The angle between a tangent and a radius is 90o, Tangents from the same point are equal in length, The angle between a tangent and a chord is equal to the angle in the alternate segment,

GCSE Circle Theorems

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