2023-02-16T13:12:11ZFluxBBhttps://www.mathisfunforum.com/viewtopic.php?id=29005Given are two parallelograms ABCD and AECF with common diagonal AC, where E and F lie inside the parallelogram ABCD. Show: The circumcircles of the triangles AEB, BFC, CED and DFA have a point in common.]]>2023-02-16T13:12:11Zhttps://www.mathisfunforum.com/viewtopic.php?pid=430924#p430924