The 7 Circle Theorems 0.0 / 5 ? MathematicsGeometryGCSEAQA Created by: mm2004Created on: 10-09-18 18:23 Circle Theorem 1 The angle at the centre is double the angle at the circumference 1 of 7 Circle Theorem 2 Angles in the same segment are equal 2 of 7 Circle Theorem 3 Opposite angles in a cyclical quadrilateral add up to 180 degrees 3 of 7 Circle Theorem 4 The angle at the circumerence in a semi circle is a right angle 4 of 7 Circle Theorem 5 The angle between a tangent and a radius is 90 degrees 5 of 7 Circle Theorem 6 The perpendicular from the centre of the circle to a chord bisects the chord. 6 of 7 Circle Theorem 7 The angle between a tangent and a chord is equal to the angle in the alternate segment 7 of 7

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