Theorem 10.11 : The sum of either pair of opposite angles of a cyclic quadrilateral is 180º.
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For chord `AB`, angles in same segment are equal.
`/_5=/_8`
Similarly, in chords `BC`, `CD`, and `AD`
`/_1=/_6`
`/_2=/_4`
`/_7=/_3`
Angle sum property of quadrilateral gives
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