JAMB Mathematics 2020 Objective — Question 21
Question 21 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2020 Objective paper, with the correct answer and a full explanation.
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A ladder 17m long rests against a vertical wall so that its foot is 8.5m from the wall. Find the angle of inclination of the ladder to the horizontal floor.
- A. 30 deg
- B. 45 deg
- C. 55 deg
- D. 60 degCorrect
Explanation
cos(theta)=8.5/17=0.5. theta=cos^-1(0.5)=60 deg.
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