The word trigonometry is a Greek word consists of two parts ‘trigonon’ and ‘metron’ which means measurements of the sides and angles of a triangle. This was basically developed to find the solutions of the problems related to the triangles in the geometry. Initially we use to measure angles in terms of degree, but now we will use another unit of measurement of angles called radians. The relation between the radian and degree measure is given by:

1 radians =(180/π)^{o }and 1o=(π/180)^{o }radians or π^{c }= |180|^{o}

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