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The angle at the centre is twice the angle at the circumference Angles in the same segement are equal The angle in a semicircle is 90 degrees Opposite angles in a cyclic quadrilateral add up to 180 degrees The perpendicular from the centre to the chord bisects the chord The angle between a tangent and a radius is 90 degrees Tangents from a point outside a circle are equal in length Alternate segment theorem

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Page 1: The angle at the centre Angles in the same The angle in a

Theangleatthecentreistwicetheangleatthe

circumference

Anglesinthesamesegement areequal

Theangleinasemicircleis90

degrees

Oppositeanglesinacyclicquadrilateraladdupto180

degrees

Theperpendicular fromthecentre tothechord

bisectsthechord

Theanglebetweenatangent andaradius

is90degrees

Tangentsfromapointoutsideacircleareequalinlength

Alternate segmenttheorem

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