A plane is flying and approaching a control tower. The angle of depression from the plane to a control tower is 15°. The directed distance from the plane to the tower is 56,000 ft. At what altitude is the plane flying at? Round to the nearest foot.

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Ratios

A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.

Trigonometric Ratios

Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.