Chapter 1.4, Problem 97E

(a)

To determine

To calculate: The value of the distance $d$ from the observer to the plane when $\theta =30°$, if an airplane is flying at an altitude of $6\text{ miles}$ and $\theta$ is the angle of elevation from the observer to the plane as shown in the figure below.

(b)

To determine

To calculate: The value of the distance $d$ from the observer to the plane when $\theta =90°$, if an airplane is flying at an altitude of $6\text{ miles}$ and $\theta$ is the angle of elevation from the observer to the plane as shown in the figure below:

(c)

To determine

To calculate: The value of the distance $d$ from the observer to the plane when $\theta =120°$, if an airplane is flying at an altitude of $6\text{ miles}$ and $\theta$ is the angle of elevation from the observer to the plane as shown in the figure below,