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From the top of a 60 m high cliff, the angle of depression to a boat in the sea

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Question: From the top of a 60 m high cliff, the angle of depression to a boat in the sea is 30 degrees. How far is the boat from the base of the cliff?

Options:

  1. 60√3 m
  2. 30√3 m
  3. 60 m
  4. 30 m

Correct Answer: 60√3 m

Solution: 

Using tan(30°) = height/distance, we have distance = height/tan(30°) = 60/√3 = 60√3 m.

From the top of a 60 m high cliff, the angle of depression to a boat in the sea

Practice Questions

Q1
From the top of a 60 m high cliff, the angle of depression to a boat in the sea is 30 degrees. How far is the boat from the base of the cliff?
  1. 60√3 m
  2. 30√3 m
  3. 60 m
  4. 30 m

Questions & Step-by-Step Solutions

From the top of a 60 m high cliff, the angle of depression to a boat in the sea is 30 degrees. How far is the boat from the base of the cliff?
  • Step 1: Understand the problem. We have a cliff that is 60 meters high and we need to find out how far the boat is from the base of the cliff.
  • Step 2: Identify the angle of depression. The angle of depression from the top of the cliff to the boat is 30 degrees.
  • Step 3: Visualize the situation. Imagine a right triangle where the height of the cliff is one side (60 m), the distance from the base of the cliff to the boat is the other side, and the line of sight to the boat is the hypotenuse.
  • Step 4: Use the tangent function. In a right triangle, the tangent of an angle is the opposite side (height of the cliff) divided by the adjacent side (distance to the boat).
  • Step 5: Write the formula. For our triangle, tan(30°) = height / distance. We can rearrange this to find distance: distance = height / tan(30°).
  • Step 6: Substitute the values. We know the height is 60 m, so we plug that into the formula: distance = 60 / tan(30°).
  • Step 7: Calculate tan(30°). The value of tan(30°) is √3 / 3.
  • Step 8: Substitute tan(30°) into the formula. Now we have distance = 60 / (√3 / 3).
  • Step 9: Simplify the equation. This is the same as distance = 60 * (3 / √3).
  • Step 10: Calculate the distance. This simplifies to distance = 60√3 meters.
  • Trigonometry – The problem involves using trigonometric ratios, specifically the tangent function, to relate the height of the cliff to the distance from the base of the cliff to the boat.
  • Angle of Depression – Understanding the angle of depression from the top of the cliff to the boat is crucial for setting up the right triangle used in the calculation.
  • Right Triangle Properties – The scenario describes a right triangle where the height of the cliff is one leg, the distance from the base of the cliff to the boat is the other leg, and the line of sight to the boat is the hypotenuse.
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