From a hotel a window 30 meters above the ground, allan finds that the angle of elevation of the top of a monument is 10 degrees and the angle of depression of the foot of the monument is 20 degrees. What is the height of the monument?

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A: Refer the figure that illustrates the given information

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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.