An engineer stands 145 feet from a building. He uses a transit telescope that stands 5 feet from the ground and views the top of the building. He measures the angle of elevation to be 50° from the horizontal, as shown in the diagram below. What is the height of the building?

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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.