An airplane over the pacific sights an atoll at a 17 degree angle of depression . if the plane is 485 m above the water, how many km is it from a point 485 m directly above the center of the atoll.

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

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