Circle Theorems 0.0 / 5 ? Mathematics2D and 3D shapeGCSEAQA Created by: ErinCostelloCreated on: 20-03-17 18:20 Theory 1 A Tangent and a radius meet at 90 degrees 1 of 9 Theory 2 Two radii form an Isosceles triangle 2 of 9 Theory 3 The perpendicular bisector of a chord passes through the center of a circle. 3 of 9 Theory 4 The angle and the center is twice the angle at the circumference 4 of 9 Theory 5 The angle in a semi-circle is 90 degrees 5 of 9 Theory 6 Angles in the same segment are equal 6 of 9 Theory 7 Opposite angles in a cyclic quadrilateral add up to 180 degrees 7 of 9 Theory 8 Tangents from the same point are the same length 8 of 9 Theory 9- Alternate Segment Theory The angle between a tangent and a chord is always equal to the angle in the opposite segment 9 of 9
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