Trigonometric Ratios

Function
Name
Abbreviation
Functions
Ratio
 
Sine sin (θ) or sin θ
side opposite θ
hypotenuse
Cosine cos (θ) or cos θ
side adjacent θ
hypotenuse
Tangent tan (θ) or tan θ
side opposite θ
side adjacent θ
Cotangent cot (θ) or cot θ
side adjacent θ
side opposite θ
Secant sec (θ) or sec θ
hypotenuse
side adjacent θ
Cosecant csc (θ) or csc θ
hypotenuse
side opposite θ
right triangle with side opposite, side adjacent and hypotenuse
 

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Furey, Edward "Trigonometric Ratios" From http://www.CalculatorSoup.com - Online Calculator Resource.