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WAEC Further Mathematics 2014 Question 24

Question 24

Vectors

Find the angle between (5i + 3j) and (3i − 5j).

  1. A.180°
  2. B.90°
  3. C.45°
  4. D.0°
Show the answer and explanation

Answer: B (90°)

Explanation

Dot product = 15 − 15 = 0, so the vectors are perpendicular: 90°.