JAMB Mathematics 2013 Objective — Question 33

Question 33 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2013 Objective paper, with the correct answer and a full explanation.

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

A. A. √108 cm
B. B. 9cm
C. C. √92 cm
D. D. 10cmCorrect

Explanation

p²=64+36−2(8)(6)(1/12)=100−8=92; p=√92≈9.59≈10. Actually p²=36+64−2(6)(8)(1/12)=100−8=92; p=√92.

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