The vectors $\overrightarrow {AB} = 3\widehat i + 4\widehat k\,\,\& \,\,\overrightarrow {AC} = 5\widehat i - 2\widehat j + 4\widehat k$ are the sides of triangle $ABC.$ The length of the median through $A$ is :
$\sqrt {288} $
$\sqrt {18} $
$\sqrt {72} $
$\sqrt {33} $
Solution
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