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The vectors AB =3 i +4 k & AC =5 i -2 j +4 k are the sides of a triangle ABC . The length of the median through A is

Options

  1. A288
  2. B18
  3. C72
  4. D33

Correct answer

D. 33

Step-by-step solution

P.V of AD = (3+5) i +(0-2) j +(4+4) k 2 =4 i - j +4 k or | AD |= 16+16+1 = 33

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