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If ABCD Is A Quadrilateral And E And F Are The Mid Points Of AC And BD Respectively, P.T AB + AD + CB + CD=4EF [THERE IS A VECTOR SYMBOL ABOVE AB,AB,CB,CD,EF] - Math Discussion

If ABCD is a quadrilateral and E and F are the mid points of AC and BD respectively, P.T AB + AD + CB + CD=4EF [THERE IS A VECTOR SYMBOL ABOVE AB,AB,CB,CD,EF]