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# If the vectors $\bar {AB}=-3 \bar {i}+ 4 \bar {k}$ and $\bar {AC}=5 \bar {i}-2 \bar j+4 \bar {k}$ are the sides of a triangle ABC, then the length of the medium through A is

$\begin {array} {1 1} (a)\;\sqrt {14} & \quad (b)\;\sqrt {18} \\ (c)\;\sqrt {25} & \quad (d)\;\sqrt {29} \end {array}$
Can you answer this question?

$(b)\; \sqrt {18}$
answered Nov 7, 2013 by