A person is looking at the top of a tree from a distance of 15 meters. If the an

Practice Questions

Q1
A person is looking at the top of a tree from a distance of 15 meters. If the angle of elevation is 30 degrees, what is the height of the tree?
  1. 15√3 meters
  2. 30 meters
  3. 45 meters
  4. 10 meters

Questions & Step-by-Step Solutions

A person is looking at the top of a tree from a distance of 15 meters. If the angle of elevation is 30 degrees, what is the height of the tree?
  • Step 1: Understand the problem. We need to find the height of a tree when looking at it from a distance of 15 meters and at an angle of elevation of 30 degrees.
  • Step 2: Recall the relationship between the height of the tree, the distance from the tree, and the angle of elevation. We can use the tangent function: tan(angle) = height / distance.
  • Step 3: Rearrange the formula to find the height: height = distance * tan(angle).
  • Step 4: Plug in the values. The distance is 15 meters and the angle is 30 degrees. We need to find tan(30 degrees).
  • Step 5: Know that tan(30 degrees) is equal to 1/√3.
  • Step 6: Substitute tan(30 degrees) into the formula: height = 15 * (1/√3).
  • Step 7: Calculate the height: height = 15/√3.
  • Step 8: To express the height in a simpler form, multiply the numerator and denominator by √3: height = (15√3)/3 = 5√3 meters.
  • Step 9: Conclude that the height of the tree is 5√3 meters.
  • Trigonometry – The problem involves using the tangent function to relate the angle of elevation to the height of the tree and the distance from the observer.
  • Right Triangle Properties – Understanding the relationship between the sides of a right triangle formed by the height of the tree, the distance from the observer, and the angle of elevation.
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