If M and N are the mid-points of the diagonals AC and BD respectively of a quadrilateral ABCD, then the of `vec (AB)+ vec(AD)+vec(CB)+vec(CD)` equals

If PQ are the mid points of diagonal AC and BD respectively of a quadrilateral ABCD ,then prove that vec AB+vec AD+vec CB+vec CD=4vec PQ

M and N are mid-point of the diagnols AC and BD respectivley of quadrilateral ABCD, then bar(AB) + bar(AD)+bar(CB)+bar(CD) =

M and N are mid-point of the diagnols AC and BD respectivley of quadrilateral ABCD, then bar(AB) + bar(AD)+bar(CB)+bar(CD) =

M and N are mid-point of the diagnols AC and BD respectivley of quadrilateral ABCD, then bar(AB) + bar(AD)+bar(CB)+bar(CD) =

If ABCD is a quadrilateral, then vec(BA) + vec(BC)+vec(CD) + vec(DA)=

In a quadrilateral ABCD, vec(AB) + vec(DC) =

In a quadrilateral ABCD, vec(AB) + vec(DC) =

ABCD is a quadrilateral. If M and N are the mid points of the sides vec(BD) and vec(AC) , respectively. Show that vec(AB)+vec(AD)+vec(CB)+vec(CD)=4vec(NM)