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Theangleatthecentre istwicetheangleatthecircumference
Anglesinthesamesegement
areequal
Theangleinasemicircleis90
degrees
Oppositeanglesinacyclic
quadrilateraladdupto180
degrees
Theperpendicularfromthecentretothechord
bisectsthechord
Theanglebetweena
tangentandaradiusis90degrees
Tangentsfromapointoutsideacircleareequal
inlength
Alternatesegmenttheorem