A newspaper reporter in a helicopter is taking pictures of a waterfall that is 170 meters tall. The helicopter is hovering 80 meters away from the waterfall and is level with the waterfall's tallest point. The reporter is focusing his camera on a point halfway down the waterfall. Approximate the angle of depression of the camera lens. 80 m 170 m

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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.