4. Points E and F lie on the sides [AB] and [AD] of the square ABCD....

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4. Points E and F lie on the sides [AB] and [AD] of the square ABCD. Construct the parallel lines EG||AD, and FH||AB, with G € CD, and He BC. Denote by I the intersection of FH with EG. Prove that lines BF, DE, and CI meet in one point. 4. Points E and F lie on the sides [AB] and [AD] of the square ABCD. Construct the parallel lines EG||AD, and FH||AB, with G € CD, and He BC. Denote by I the intersection of FH with EG. Prove that lines BF, DE, and CI meet in one point.

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