Math Problem Statement
A woman standing on a hill sees a flagpole that she knows is 55 ft tall. The angle of depression to the bottom of the pole is 14°, and the angle of elevation to the top of the pole is 18°. Find her distance x from the pole. (Round your answer to one decimal place.)
Solution
This problem involves using trigonometry to find the distance from the woman to the flagpole, denoted as . We'll be using the angles of depression and elevation, along with the height of the flagpole, to set up our equations.
Step 1: Break the problem into two triangles
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Triangle 1: Involving the angle of depression to the bottom of the pole.
- The angle of depression is .
- Let the horizontal distance between the woman and the base of the flagpole be .
- The height from the woman's eye level to the base of the pole is unknown (denote this height as ).
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Triangle 2: Involving the angle of elevation to the top of the pole.
- The angle of elevation is .
- The total height of the flagpole is 55 feet, so the height from the woman’s eye level to the top of the pole will be .
Step 2: Set up trigonometric equations
We will use the tangent function because it relates angles to the ratio of the opposite side over the adjacent side.
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For Triangle 1 (angle of depression): Therefore:
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For Triangle 2 (angle of elevation): Therefore:
Step 3: Solve the system of equations
Substitute into the second equation: Simplify and solve for :
Now, we can calculate using the tangent values of and .
Final Answer:
The woman is approximately 95.8 feet away from the flagpole.
Would you like further details or clarifications?
Here are 5 related questions you might find helpful:
- How would the solution change if the flagpole were 70 feet tall?
- What if the angle of elevation were larger, say 25°?
- How can the distance be calculated if only one angle is given?
- Can the method be applied if the observer is standing on a flat surface?
- How do the angles of elevation and depression affect the height of the triangles?
Tip: Always ensure your calculator is set to degrees when dealing with angle problems in trigonometry.
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Math Problem Analysis
Mathematical Concepts
Trigonometry
Angles of Elevation and Depression
Tangent Function
Formulas
tan(θ) = opposite / adjacent
h1 = x * tan(14°)
55 - h1 = x * tan(18°)
x = 55 / (tan(18°) + tan(14°))
Theorems
Tangent function in right-angle triangles
Suitable Grade Level
Grades 10-12
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