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JAMB Mathematics 2013 Question 33

Question 33

Trigonometry

In triangle PQR, q = 8 cm, r = 6cm and Cos P = 1/12. Calculate the value of p.

  1. A.√108 cm
  2. B.9cm
  3. C.√92 cm
  4. D.10 cm
Show the answer and explanation

Answer: C (√92 cm)

Explanation

Cosine rule: p2 = 64 + 36 − 2 × 8 × 6 × 1/12 = 100 − 8 = 92, so p = √92 cm.