Trigonometry is the branch of mathematics dealing with similar planar and spherical triangles. It was originally invented for astronomers to measure distances of stars, planets, etc. Because in that time, astronomy was one of the main fields of science. Trigonometry is used in a variety of jobs. Flight coordinators use it to determine travel through air currents. The height of a tree was 98.9 inches, and the height of the garage was 77.2.
Sources:
(http://dictionary.reference.com/browse/trigonometry)
(http://www.math.rutgers.edu/~cherlin/History/Papers2000/hunt.html)
(http://wiki.answers.com/Q/Enumerate_the_applications_of_trigonometry_of_different_fields)
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