GCSE Maths | Circle Theorems

• The angle between a tangent and radius is always 90^o
• The angle at the centre is always double the angle at the circumference
• The angle formed by a semi circle is always 90⁰.
• Opposite angles in a cyclic quadrilateral add up to 180^o.
• Two angles from the same points are equal.
• Angles in the alternate segment are equal.

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