# What Is Trigonometry

i) A ration shows approximate sizes of two or more values. Ratios can be shown in different ways. For example 1:3 (one to three), ¼ (one fourth). ii)

* Sine (θ) = Opposite x Hypotunese-1

* Cosine (θ) = Adjacent x Hypotunese-1

* Tangent (θ) = Opposite x Adjacent -1

iii) You can remember this equations throughout a word SohCahToa Trigonometry came from…

i) The term “trigonometry,” although not of native Greek origin, comes from the Greek word trigonon, meaning “triangle,” and the Greek word -metria, meaning“measurement.” As the name implies, trigonometry ultimately developed from the study of right triangles by applying the relationships between the measures of its sides andangles to the study of similar triangles. However, the word “trigonometry” did not exist upon the birth of the subject, but was later introduced by the German mathematician and astronomer, Bartholomaeus Pitiscus in the title of his work, Trigonometria sive de solutione triangularum tractatus brevis et perspicius…, publishedin 1595 ii) In our days, we have a lot of use for trigonometry. We can use trigonometry in Astronomy, geography, engineering, physics and finally mathematics. Trigonometric tables were created over two thousand years ago for studying astronomy. The stars were thought to be fixed on a crystal sphere of great size, and that model was perfect for practical purposes. Only the planets moved on the sphere. The kind of trigonometry needed to understand positions on a sphere is called spherical trigonometry. Spherical trigonometry is rarely taught now since its job has been taken over by linear algebra. However, one of application of trigonometry is astronomy. Physics lays heavy demands on trigonometry. Optics and statics are two early fields of physics that use trigonometry, but all branches of physics use trigonometry since trigonometry aids in understanding space. Related fields such as physical chemistry naturally use...

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