Question 118
Let $E$ be the intersection point of the segments $AB$ and $CD$. Points $X$ and $Y$ are marked in the plane such that the quadrilaterals $AECX$ and $BEDY$ are parallelograms.
Prove that the lines $AD$, $BC$, and $XY$ are either pairwise parallel or concurrent.
(M. Karpuk, A. Voidelevich)
Prove that the lines $AD$, $BC$, and $XY$ are either pairwise parallel or concurrent.
(M. Karpuk, A. Voidelevich)