1.

If vec(AB)= vec(b) and vec(AC)= vec( c), then the length of the perpendicular from A to the line BC is

Answer»

`|(vec(b) XX vec(C ))/(vec(b) + vec(c ))|`
`|(vec(b) xx vec(c ))/(vec(b)-vec(c ))|`
`(1)/(2) |(vec(b) xx vec(c ))/(vec(b) -vec(c ))|`
`2|(vec(b) xx vec( c))/(vec(b) -vec(c ))|`

Answer :B


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