An airplane is flying at 4000 feet above the ground. If the angle of depression from the airplane to the beginning of the runway is 6.4 degrees, what is the horizontal distance to the nearest tenth of a mile of the airplane to the beginning of the runway?

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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.