In a convex quadrangle ABCD points M and N are respectively centres of sides AB and CD. E is the point of intersection of the quadrangle's diagonals. Prove that the line containing bisector of is perpendicular to the line MN only if

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- September 8th 2010, 07:42 AMPaulinaAnnaConvex quadrangle ABCD, midpoints of its sides, diagonals
In a convex quadrangle ABCD points M and N are respectively centres of sides AB and CD. E is the point of intersection of the quadrangle's diagonals. Prove that the line containing bisector of is perpendicular to the line MN only if

- September 8th 2010, 07:58 AMPim
I find it funny how this is the exact same question except with M, N and X, Y switched. http://www.mathhelpforum.com/math-he...al-155234.html

(My reply to this question remains the same as the other one.)