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Circle Geometry - Coggle Diagram
Circle Geometry
Angle Properties
An angle at the centre of a circle is twice any angle at the circumference subtended by the same arc
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Tangent Properties
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The line joining the external point to the centre of the circle bisects the angle between the tangents
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The angle which a chord makes with a tangent at its point of contact is equal to the angle in the alternate segment
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Cyclic Quadrilaterals
In a cyclic quadrilateral, the opposite angles are supplementary (i.e. their sum is 180°)
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