If `A, B, C, D and E` are five coplanar points, then the value of `bar(DA)+bar(DB)+bar(DC) + bar(AE) +bar( BE) +bar (CE)` is equal to

If A,B,C,D and E are five coplanar points,( then the value of )/(DA)+bar(DB)+bar(DC)+bar(AE)+bar(BE)+bar(CE) is equal to

If ABCDE is a pentagon, then bar(AB) + bar(AE) + bar(BC) + bar(DC) + bar(ED) =

In DeltaABC , P, Q and R are mid points of the sides AB, BC, and CA respectively. If D is any point i) then express bar(DA)+bar(DB)+bar(DC) in terms of bar(DP), bar(DQ) and bar(DR) ii) If bar(PA)+bar(QB)+bar(RC)=bar(a) then find bar(a) .

ABCDE is a pentagon then bar(AB)+bar(AE)+bar(BC)+bar(DC)+bar(ED)+bar(AC)=

[bar(a)xx bar(b)" "bar(a)xx bar( c )" "bar(d)] = …………….

The value of [(bar(a)+2bar(b)-bar(c))(bar(a)-bar(b))(bar(a)-bar(b)-bar(c))] is equal to the box product

i) If bar(a), bar(b), bar(c) are non coplanar vectors, then prove that the vectors 5bar(a)-6bar(b)+7bar(c), 7bar(a)-8bar(b)+9bar(c) and bar(a)-3bar(b)+5bar(c) are coplanar.