Answer: Option 'C' is correct.
Step-by-step explanation:
Since we have given that
Distance between dam to the angle of elevation = 115 m
Angle of elevation = 50°
We need to find the "Height of river dam":
We will use "Trigonometric Ratio":
[tex]\tan 50^\circ=\frac{Perpendicular}{Base}\\\\\tan 50^\circ=\frac{Height}{115}\\\\115\tan 50^\circ=Height\\\\137.05\ m=Height[/tex]
Hence, Option 'C' is correct.
