In mathematics, the trigonometric functions are real functions which relate an angle of a right-angled triangle to ratios of two side lengths. They are widely used in all sciences that are related to geometry, such as navigation, solid mechanics, celestial mechanics, geodesy, and many others. Trigonometry is concerned with the measurement and calculation of the lengths of sides and the sizes of angles of triangles. There are three fundamental ratios called the sine, the cosine and the tangent of the angle. These are abbreviated to sin, cos and tan. Trigonometry Ratios is composed of only one exercise which includes concepts such as, trigonometric ratios of an acute angle of a right triangle, reciprocal relations, T-ratios of an angle, quotient relation of T-ratios and squared relation.