A light tower is going to be installed on the left edge of the Skywalk as indicated in the diagram above.  The light will shine down to the opposite edge of the Skywalk indicated with the star in the diagram above.  How tall does the light tower need to be if the angle of depression is 51°?

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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.