A video explaining how to prove the six circle theorems needed for the GCSE examinations. This is suitable for the higher GCSE maths course.
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0:00 Intro
0:38 Proof 1 - Angles in a semicircle is 90°
4:49 Proof 2 - Angle at the centre is twice the angle at the circumference
7:53 Proof 3 - Opposite angles in a cyclic quadrilateral add to 180°
10:00 Proof 4 - Angles at the circumference in the same segment are equal
11:23 Proof 5 - Alternate Segment Theorem
13:49 Proof 6 - A radius bisects a chord at 90°
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