An Airplane Flies at an Altitude Of $a = 6$ Miles Toward a Point Directly Over an Observer

Multiple Choice

An airplane flies at an altitude of $a = 6$ miles toward a point directly over an observer.Consider $\theta$ and x as shown in the figure.Write $\theta$ as a function of x.

A) $\theta = \operatorname { arccsc } \frac { x } { 6 }$
B) $\theta = \operatorname { arccot } \frac { 6 } { x }$
C) $\theta = \arcsin \frac { x } { 6 }$
D) $\theta = \arctan \frac { 6 } { x }$
E) $\theta = \arctan \frac { x } { 6 }$