[" 1."ABCD" is a quadrilateral.Prove that "],[vec BA+vec BC+vec CD+vec DA=2vec BA]

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

ABCD is a quadrilateral.Find the sum the vectors vec BA,vec BC, and vec DA.

If ABCD is a quadrillateral such that vec(AB) = vec(i) + 2vec(j), vec(AD)= vec(j) + 2vec(k) and vec(AC)= 2 (vec(i) + 2vec(j)) + 3(vec(j) + 2vec(k)) , then area of the quadrilateral ABCD is

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

A,B,C,D are any four points,prove that vec AB*vec CD+BC*vec AD+vec CA*vec BD=0

ABCD is a quadrilateral. Forces vec(AB), vec(CB), vec(CD) and vec(DA) act along its sides. What is their resultant ?

ABCD is a quadrilateral. Force vec(AB), vec(CB), vec(CD) and vec(DA) act along its sides. What is their resultant ?

ABCDE is a pentagon prove that vec(AB)+vec(BC)+vec(CD)+vec(DE)+vec(EA)=vec0

If P is a point and ABCD is a quadrilateral and vec AP+vec PB+vec PD=vec PC, show that ABCD is a parallelogram.

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