Circle theorems
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Last updated 3:35 PM on 6/11/25
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8 Terms
1
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A tangent and a radius meet at 90 degrees
2
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Angles at the centre of the circle is twice the angle of the circumference
3
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Angles in semi-circle are 90 degrees
4
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Angles in same segment are equal
5
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Opposite angles in a cyclic quadrilateral add to 180 degrees
6
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Tangents from the same point are the same length
7
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The angle between a tangent and a chord is equal to the angle in the alternate segment
8
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The perpendicular from the centre of a chord bisects the chord
