Question

An observer on the ground at point A watches a rocket ascend. The observer is 1200 feet from the launch point B. As the rocket rises, the distance d from the observer to the rocket increases. a. Express the measure of angle A in terms of d. b. Find the measure of angle A if d = 1500 feet. c. Find the measure of angle A if d = 2000 feet.

Answer 1

Use the cosine of angle A (sine is adjacent/hypotenuse)

\[\Large \cos A = \frac{ 1200}{ d}\]
Now try to rearrange that for d = ...