The two vectors hati+hatj+hatk and hati+...

The two vectors `hati+hatj+hatk and hati+3hatj+5hatk` represent the two slides `vec(AB) and vec(AC)` respectively of a `DeltaABC`. The length of the median through A is

A

`sqrt(14)`

B

`(sqrt(14))/(2)`

C

14

D

7

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