Circle Theorems 3.5 / 5 based on 3 ratings ? MathematicsCircle TheoremsGCSEAQA Created by: larmitage4nr9Created on: 14-10-16 15:39 Circle Theorem 1 - Two tangents... Two tangents from the same point are equal in length. 1 of 9 Circle Theorem 2 - The angle at...Twice... The angle at the centre is twice the angle at the circumference. 2 of 9 Circle Theorem 3 - Angles...Segment... Angles in the same segment are equal. 3 of 9 Circle Theorem 4 - An angle...Semi Circle... An angle inscribed in a semi circle is always 90 degrees. 4 of 9 Circle Theorem 5 - Cyclic quad... Opposite angles in a cyclic quadrilateral add to 180 degrees. 5 of 9 Circle Theorem 6 - Two radii... Two radii make an isosceles triangle. 6 of 9 Circle Theorem 7 - Tangent and radius... A tangent and a radius make a right angle. 7 of 9 Circle Theorem 8 - Alternate segment... The angle between the tangent and chord at the point of contact is equal to the angle in the alternate segment. (Alternate segment theory). 8 of 9 Circle Theorem 9 - Perpendicular bisector... The perpendicular bisector of a chord passes through the circle's centre. 9 of 9
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