The illustration depicts two hills of different heights LM and TP. Whe...
Step 1: Question statement and Inferences
The question asks us to find the length of NL.
Let NL = x feet
We are given that the angle between the horizontal and a person’s line of sight when he looks at point T from point L is 30o.
This means, in right triangle LNT, Angle NTL = 30∘
Let’s depict this information in the figure:
Step 2: Finding required values
By applying the Angle Sum Property in right triangle LNT, we get
Angle TLN = 60°
Thus Triangle LNT is a 30°-60°-90° triangle. In a 30°-60°-90° triangle, the sides opposite to the angles 30°, 60°, and 90° respectively are in the ratio 1 : √3 : 2
That is, LN: NT : TL = 1 : √3 : 2
Also, in quadrilateral MPTN, lines MN and PT are both drawn perpendicular to the same line MP. Therefore, lines MN and PT are parallel to one another. Also, line NT is perpendicular to the vertical line MN; therefore, line NT is parallel to the horizontal line MP.
Thus, quadrilateral MPTN is made up of two sets of parallel lines and the enclosed angle is 90°
This means, quadrilateral MPTN is a rectangle.
Now, the opposite sides of a rectangle are equal.
Therefore, NT = MP = 500 feet
Step 3: Calculating the final answer
Therefore,
Hence, the correct answer is Option A