A plane at an elevation of 5.5 km, approaches the airport at an angle of depression of 30°. А 30° 5.5 km B How far is the plane from the airport along it's descending flight path, x, to the nearest tenth of a kilometre?

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A: In △ACD, tan 12∘=DCACAC=450tan 12∘=4500.2125≈2117 ft

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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.