ISRO Mechanical & Aerospace 2013 - Question 50

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Vector a = 3i + 2j - 6k, vector b = 4i - 3j + k, angle between above vectors is

  • A. 90°
  • B. 0°
  • C. 45°
  • D. 60°

Answer: A. 90°

Explanation: Dot product a.b = 3*4 + 2*(-3) + (-6)*1 = 12 - 6 - 6 = 0. Since dot product is zero, vectors are perpendicular.

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