
A laser range finder records the distance from the laser to the base and from the laser to the top of a building as shown in Fig. P3.1. Find the angle θ and the height of the building.

The angle θ and the height of the building.
Answer to Problem 1P
The height of the building is 66.14 m and the angle θ
is 41.4°.
Explanation of Solution
Given:
The given figure representing the building top and range finder is shown below.
Calculation:
Consider the below figure.
First calculate an angle θ ,
From the right angle triangle
cosθ=Adjecent sideHypotenuse
cosθ=75100θ=cos−1(75100)=41.4°
Therefore the angle θ
is 41.4°.
For the height of the building,
sinθ=opposite sideHypotenuse
sin(41.4°)=h100
0.6614=h100
h=0.6614×100=66.14m
Conclusion:
Thus, the height of the building is 66.14 m and the angle θ
is 41.4°.
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