McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
5. Angles of Elevation and Depression
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Exercise 15 Page 666

Recall the definition of tangent.

≈ 240.2 ft

Practice makes perfect

We are given that from the position of the bus on the street, the 162-foot L'arc de Triomphe is at an angle of 34^(∘), and we are asked to evaluate how far the bus is from the arc. Let x represent this distance.

Since we are given that the angle of elevation is 34^(∘), we can use one of the trigonometric ratios to evaluate the value of x. Let's recall that the tangent of ∠ A is the ratio of the leg opposite ∠ A to the leg adjacent ∠ A. Using this definition, we can create an equation for tan 34^(∘). tan 34^(∘)=162/x Let's solve the above equation.
tan 34^(∘)=162/x
xtan34^(∘)=162
x=162/tan 34^(∘)
x=240.17487...
x≈ 240.2
The bus is approximately 240.2 feet away from the arc.