Trigonometry simply means calculations with triangles. It is a study of relationships in mathematics involving lengths, heights and angles of different triangles. The most effective and progressive use of trigonometry is to analyze and simplify equations using various trigonometric functions like sine, cosine, tangent etc. Analytical use of trigonometry plays a vital role in engineering fields like mechanical engineering, electronics and mechatronics. There are lots of daily life examples for trigonometry. Engineers routinely use trigonometric concepts to calculate angles. Civil and mechanical engineers use trigonometry to calculate torque and forces on objects, such as bridges or building girders. An example is the calculation of the static forces on an object that is not moving—such as a bridge. For another example, in physics, trigonometry is used to find the components of vectors, model the mechanics of waves (both physical and electromagnetic) and oscillations, sum the strength of fields, and use dot and cross products. Even in projectile motion you have a lot of applications of trigonometry. In addition, chemistry, and physics in particular, use trigonometry quite often. If you have a diagonal line in a 2D plane, you can use trigonometry to work out the horizontal and vertical components of the line. If you have a vector quantity, it will often have perpendicular components, and trigonometry can be used to work out the magnitude of these components.