An observer (o) spots a plane flying at a 55° angle to his horizontal line of sight. if the plane is flying at an altitude of 21,000 ft., what is the distance (x) from the plane (p) to the observer (o)?

25641 feet

Step-by-step explanation:

It is given that An observer (O) spots a plane flying at a 55° angle to his horizontal line of sight and the plane is flying at an altitude of 21,000 feet.

Thus, from the figure, OP=x feet, PA=21,000ft and m∠O=55°

Now, using the trigonometry, we have

Substituting the given values, we get

Therefore, the distance x from the plane P to the observer O is 25641 feet.