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A B C D is a cyclic quadrilateral whos...

`A B C D` is a cyclic quadrilateral whose diagonals `A C\ a n d\ B D` intersect at `P`. If `A B=D C ,` prove that:
(i) ` P A B\ ~= P D C`
(ii) `P A=P D\ a n d\ P C=P B`
(iii) `A D || B C`

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