engineering mathematics MCQ #97

The angle of elevation of the top of a building from a point on the ground is 30°. On moving 20 m closer, it becomes 45°. Find the height.

engineering mathematics MCQ #97

  1. Question 1

    Q1. The angle of elevation of the top of a building from a point on the ground is 30°. On moving 20 m closer, it becomes 45°. Find the height.

    • A) 10(√3 + 1) m
    • B) 10(√3 - 1) m
    • C) 20(√3 + 1) m
    • D) 10 m

    Answer: 10(√3 + 1) m

    Explanation: Using tan(30°) = h/x and tan(45°) = h/(x - 20), we get h = 10(√3 + 1) m.