There must be a typo . . . The problem makes no sense.
are midpoints of arcs of a circle
and segment cuts chords at , resp.
Prove: . . ??Code:C A * * o o | * * | | * * | | * | | * |P |Q * X o - + - - - + - - - o Y * | | * | | * | | * * | | * o | * B * * o D
We can see that is never equal to