Circle Theorems Edexcel IGCSE Maths

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Last updated 11:44 AM on 5/13/26
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10 Terms

1
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The angle subtended by an arc at the centre is twice the angle at the circumference

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2
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The angle in a semicircle is a right angle

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3
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The perpendicular bisector of a chord is a radius

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4
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A radius and a tangent are perpendicular

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5
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Two tangents from a circle to the same point outside of a circle are equal length

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6
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Opposite angles in a cyclic quadrilateral add up to 180

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7
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Angles at the circumference subtended by the same arc are equal

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8
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Alternate Segment Theorem

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9
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Intersecting Chord Theorem

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10
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External Intersecting Chord Theorem

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