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What are Trigonometric Ratios?

The relationships between the angles and the sides of a right triangle are expressed in terms of six trigonometric ratios.

The sine (sin) of an angle is the side opposite the angle divided by the hypotenuse (sin = opp/hyp). 

The cosine (cos) of an angle is the adjacent leg divided by the hypotenuse (cos = adj/hyp).

 The tangent (tan) of an angle is the opposite leg divided by the adjacent leg (tan = opp/adj).

The reciprocals of these functions are the cosecant (cosec = hyp/opp), secant (sec = hyp/adj), and cotangent (cot = adj/opp).