Circle Theorems 4.0 / 5 based on 3 ratings ? MathematicsCircle TheoremsGCSEEdexcel Created by: DJSaltCreated on: 02-03-17 16:08 Circle theorem 1 Angles at the centre are double the angle at the circumference 1 of 8 Circle theorem 2 Angles in a semi-circle are 90 degrees. 2 of 8 Circle theorem 3 Angles in the same segment are equal 3 of 8 Circle theorem 4 Opposite angles in cyclic quadrilaterals add up to 180 degrees 4 of 8 Circle theorem 5 Lengths of tangents are equal if from the same point 5 of 8 Circle theorem 6 The angle between the radius and the tangent is 90 degrees 6 of 8 Circle theorem 7 The angle between the tangent and chord is equal to the angle in the alternate segment. This is called alternate segment theorem. 7 of 8 Circle theorem 8 Radius may bisect the chord which can produce a right angle. 8 of 8
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