Two tangents from a point are equal in length., Angles in a semi-circle are 90°., Opposite angles in a cyclic quadrilateral add up to 180°., The angle at the centre is double the angle at the circumference., Angles in the same segment are equal., A radius that is perpendicular to a chord will bisect that chord., Angles in the opposite segment are equal., Tangents from a point meet the circle at right angles..

circle theorems sketch tile

Created byejones1

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