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Trigonometry (from Greek trigonon, "triangle" and metron, "measure") is a branch of mathematics that studies relationships involving lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies.

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There is an enormous number of uses of trigonometry and trigonometric functions. For instance, the technique of triangulation is used in astronomy to measure the distance to nearby stars, in geography to measure distances between landmarks, and in satellites navigation systems. The sine and cosine functions are fundamental to the theory of periodic functions, such as those that describe sound and lightwaves.

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Other applications is: astronomy (especially for locating apparent positions of celestial objects, in which spherical trigonometry is essential) and hence navigation (on the oceans, in aircraft, and in space), music theory, audio synthesis, acoustic, optics, electronics, biology, medical imaging (CT scans and ultrasound), pharmacy, chemistry, number theory (and hence cryptology), seismology, meteorology, oceanography, many physical science, land surveying and geodesy, architecture, image compressions, phonetics, economics, electrical engineering, mechanical engineering, civil engineering, computer graphics, cartography, crystallography and game development.

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In astronomy, trigonometry is often used to find distances to nearby stars and other celestial objects using a method of parallax. Parallax can be defined as the apparent shift of a nearby star against the fixed background that can be noticed as the Earth orbits the sun.

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In trigonometry, the law of sines, sine law, sine formula, or sine rule is an equationrelating the lengths of the sides of a triangle(any shape) to the sines of its angles. According to the law,
where a, b, and c are the lengths of the sides of a triangle, and A, B, and C are the opposite angles (see the figure to the right), while d is the diameter of the triangle's circumciercle.

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Given: side a = 20, side c = 24, and angle C = 40°. Angle A is desired.
Using the law of sines, we conclude that:

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The contribution of the egypt to trigonometry

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The team
-Gianmarco Langella (at the first photo on the computer on the left) responsible for the informatics work.
-Chiara Saba (at the first photo on the right computer) responsible for the oral explosion.
-Matteo Maurizi and Francesca Verdiglione (at the first photo respectively standing on the right and on the left) responsible for the Information research.

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Gianmarco Langella (responsible for computer work) at work on the padlet

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The first oral exposure in the laboratory

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The first oral exposure in the laboratory

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The contribution of the Egyptians in trigonometry

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The contribution of the Egyptians in trigonometry