1.

If the vectors vec(a), vec(b), vec(c ) are represents the sides vec(BC), vec(CA) and vec(AB) respectivley of triangle ABC, then

Answer»

`vec(a).vec(B) = vec(b).vec(c )= vec(c ).vec(a)= 0`
`vec(a)XX vec(b)= vec(b) xx vec(c )= vec(c ) xx vec(a)`
`vec(a) xx vec(b) + vec(b) xx vec(c )+ vec(c ) xx vec(a)= vec(0)`
`vec(a).vec(b) + vec(b).vec(c )+ vec(c ).vec(b)= 0`

Answer :B


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