From a window 30 feet above the level ground, a building 100 feet high, and at a distance of 200 feet, is observed. Find the angle of elevation of the top of the building and the angle of depression of its base.

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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.