Circle Theorems (copy)

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8 Terms

1
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Angle at circumference is half that at the centre

2
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Bowtie rule - Angles in the same segment are equal

3
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Opposite angles in a cyclic quadrilateral add to 180Ā°

4
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The angle at the circumference of a semicircle is 90Ā°

5
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The angle between a tangent and a radius is 90Ā°

6
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The perpendicular from the centre of a circle to a chord bisects the chord.

7
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Alternate Segment Theorem-The angle between a tangent and a chord is equal to the angle in the alternate segment.

8
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Tangents meeting at the same point are the same length