Y by
Let the
be a quadrilateral without parallel sides, inscribed in a circle. Let
and
be the intersection points between the lines containing the quadrilateral opposite sides. Show that the bisectors to the angles at
and
are parallel to the bisectors of the angles at the intersection point of the diagonals of the quadrilateral.





This post has been edited 4 times. Last edited by parmenides51, Jun 21, 2022, 1:57 AM