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A man is standing on a hill that is 80 m high. If he looks down at an angle of d

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Question: A man is standing on a hill that is 80 m high. If he looks down at an angle of depression of 30 degrees, how far is he from the base of the hill?

Options:

  1. 40 m
  2. 60 m
  3. 80 m
  4. 100 m

Correct Answer: 40 m

Solution: 

Using tan(30°) = height/distance, we have 1/√3 = 80/distance. Therefore, distance = 80√3 ≈ 138.56 m.

A man is standing on a hill that is 80 m high. If he looks down at an angle of d

Practice Questions

Q1
A man is standing on a hill that is 80 m high. If he looks down at an angle of depression of 30 degrees, how far is he from the base of the hill?
  1. 40 m
  2. 60 m
  3. 80 m
  4. 100 m

Questions & Step-by-Step Solutions

A man is standing on a hill that is 80 m high. If he looks down at an angle of depression of 30 degrees, how far is he from the base of the hill?
Correct Answer: 138.56 m
  • Step 1: Understand the problem. A man is on top of a hill that is 80 meters high and looks down at an angle of 30 degrees.
  • Step 2: Visualize the situation. Imagine a right triangle where the height of the hill is one side (80 m), the distance from the man to the base of the hill is the other side, and the line of sight from the man to the base of the hill is the hypotenuse.
  • Step 3: Identify the angle of depression. The angle of depression is the angle between the horizontal line from the man and the line of sight down to the base of the hill, which is 30 degrees.
  • Step 4: Use the tangent function. In a right triangle, the tangent of an angle is equal to the opposite side (height of the hill) divided by the adjacent side (distance from the base). So, tan(30°) = height/distance.
  • Step 5: Substitute the known values into the equation. We know the height is 80 m, so we write tan(30°) = 80/distance.
  • Step 6: Calculate tan(30°). The value of tan(30°) is 1/√3.
  • Step 7: Set up the equation: 1/√3 = 80/distance.
  • Step 8: Rearrange the equation to solve for distance: distance = 80 * √3.
  • Step 9: Calculate the distance. Using a calculator, 80 * √3 is approximately 138.56 m.
  • Step 10: Conclude that the man is approximately 138.56 meters from the base of the hill.
  • Trigonometry – The problem involves using the tangent function to relate the angle of depression to the height of the hill and the horizontal distance from the base.
  • Angle of Depression – Understanding that the angle of depression is measured from the horizontal line down to the line of sight.
  • Right Triangle Properties – The scenario can be visualized as a right triangle where the height of the hill is one leg and the distance from the base is the other leg.
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