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May 17, 2017 at 20:47 comment added gt6989b @JackD'Aurizio I see, i interpreted both given angles to be actual angles of the quadrilateral...
May 17, 2017 at 20:43 vote accept Ivalin
May 17, 2017 at 20:04 comment added Jack D'Aurizio @gt6989b: there is nothing wrong with the given constraints, have a look at the picture below (with $C\equiv C_2$).
May 17, 2017 at 20:02 answer added Jack D'Aurizio timeline score: 5
May 17, 2017 at 19:48 comment added Ivalin Well in this problem AD is actually a side of the quadrilateral. It's easy to prove that AD is the diameter of the circumscribed circle of ABCD. I am stuck with the further solution.
May 17, 2017 at 19:24 comment added gt6989b I would think the quadrilateral should be $ABDC$ or $ACBD$ but $ABCD$ is not possible, as it seems that $AD$ is a diagonal, not a side.
May 17, 2017 at 19:07 review First posts
May 17, 2017 at 19:08
May 17, 2017 at 19:06 history asked Ivalin CC BY-SA 3.0