If ABCD is a parallelogram, then `vec(AC) - vec(BD) = `

If ABCD is a parallelogram then vec(AB) + vec(AD) + vec(CB) + vec(CD) = …………………… .

If ABCD is a parallelogram, then vec(AB)+vec(AD)+vec(CB)+vec(CD) is equal to

If ABCD is a parallelogram then bar(AC)+bar(BD)=

If ABCD is a parallelogram and vec AB = vec a , vec BC= vec b then show that vec AC = vec a+ vec b and vec BD = vec b- vec a .

If ABCD is a parallelogram and vec AB = vec a , vec BC= vec b then give geometrical significance of |quad vec a+ vec b|=|quad vec a- vec b| .

Let ABCD is a parallelogram and vec AC,vec BD be its diagonal,then vec AC+vec BD is

In a parallelogram ABCD. Prove that vec(AC)+ vec (BD) = 2 vec(BC)

ABCD is a parallelogram . If vec(AB)=vec(a), vec(BC)=vec(b) , then what vec(BD) equal to ?