Circle Theorems 0.0 / 5 ? MathematicsAnglesGCSEAQA Created by: xxSoniaCreated on: 11-04-14 16:06 Angle at centre The angle at the centre is twice the angle at the circumference 1 of 7 Angles is a semi-circle The angle at a circumference in a semi-circle is 90' 2 of 7 Angle is the same segment Angles in the same segment of a circle are the same to each other 3 of 7 Cyclic quadrilateral The opposite angles in a cyclic quadrilateral add up to 180 degrees 4 of 7 Tangent The angle made by a tangent and the radius is a right angle 5 of 7 Alternate Segment The angle between a tangent and a chord at the point of contact is equal to the angle made by the chord in an other segment off the circle 6 of 7 Two tangents From any point outside the circle, you can only draw two tangents to the circle, and theses tangents will be equal in length 7 of 7
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