Maths-TRIG 0.0 / 5 ? MathematicsTrigonometryGCSEEdexcel Created by: 13yhalawCreated on: 25-11-17 20:03 Circle theorem 1 Angles at the centre are double the angle at the circumference A diagram 1 of 8 Circle theorem 2 Angles in a semi-circle are 90 degrees. A diagram 2 of 8 Circle theorem 3 Angles in the same segment are equal A diagram 3 of 8 Circle theorem 4 Opposite angles in cyclic quadrilaterals add up to 180 degrees A diagram 4 of 8 Circle theorem 5 Lengths of tangents are equal if from the same point A diagram 5 of 8 Circle theorem 6 The angle between the radius and the tangent is 90 degrees A diagram 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. A diagram 7 of 8 Circle theorem 8 Radius may bisect the chord which can produce a right angle A diagram 8 of 8
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