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Trigonometry uses the fact that ratios of pairs of sides of triangles are functions of the angles. The basis for mensuration of triangles is the right-angled triangle. The term trigonometry means literally the measurement of triangles. Trigonometry is a branch of mathematics that developed from simple measurements. A theorem is the most important result in all of elementary mathematics. It was the motivation for a wealth of advanced mathematics, such as Fermat's Last Theorem and …

…angles of right triangles. Knowing how to use these relationships and ratios, is absolutly necessary for almost everthing. It might not seem like it, but trigonometry is used almost everywhere. Another example of the importance of the theorem is the world orb symbol, which depicts engineering studies. Although there are many parts to this symbol, the Pythagorean theorem is appropriately at the center, since much of engineering, mensuration, logarithms etc., are based on trigonometric functions.