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Use the trigonometric ratio for tangent. Then, subtract the heights.
33.4 feet
We are 330 feet from the base of a building. The angles of elevation to the top and bottom of a flagpole on top of the building are 55^(∘) and 53^(∘). We want to find the height x of the flapole. To do so, we will start by drawing a diagram of this situation.
Now, we will calculate the height h from the bottom of the building to the bottom the flagpole. From the diagram, we can see that the ground and the building form a right angle. Then, we can use the trigonometric ratio for tangent to find the height h.
tan θ = Opposite/Adjacent
LHS * 330=RHS* 330
Use a calculator
Round to 1 decimal place(s)
Rearrange equation
Next, we want to find the height H from the bottom of the building to the top of the flagpole. We will use again the trigonometric ratio for tangent. This time the measure of the angle is 55^(∘), the length of the adjacent side is 330, and the length of the opposite side is H. tan 55^(∘) = H/330 We will solve this equation to obtain the value of H.
LHS * 330=RHS* 330
Use a calculator
Round to 1 decimal place(s)
Rearrange equation
Now that we have the heights, we will subtract them to determine the height of the flagpole. x= H - h ⇒ x=33.4 feet