The triangle formed is a right triangle, use the next trigonometric ratio for right triangles to find the measure of angle θ:
[tex]\begin{gathered} \cos \theta=\frac{adjacent}{hypotenuse} \\ \\ \text{adjacent leg: 3660 ft} \\ \text{hypotenuse: 4150ft} \\ \\ \cos \theta=\frac{3660ft}{4150ft} \\ \\ \theta=\cos ^{-1}(\frac{3660ft}{4150ft}) \\ \\ \theta\approx28 \end{gathered}[/tex]Then, the angle of elevation is 28°
