Angle at centre twice angle at circumference, Angle in a semicircle is 90o - Angle in a semicircle is 90o, Angles in the same segment are equal - Angles in the same segment are equal, Opposite angles cyclic quad add up to 180o - Opposite angles cyclic quad add up to 180o, Tangent is perpendicular to radius - Tangent is perpendicular to radius, Tangents from a point are equal - Two tangents from a point to a circle are equal, Alternate segment theorem - Angles in the alternate segment are equal,

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