Trigonometrical Ratio

Things to remember

The six trigonometric ratio of ΔABC right angled at B with reference angle Θ are as follow :

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• $\frac{AB}{BC}$ = $\frac{p}{b}$ = Tangent of angle θ = Tanθ
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• $\frac{AB}{CA}$ = $\frac{p}{h}$ = Sine of angle θ= Sinθ
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• $\frac{BC}{AB}$ = $\frac{b}{p}$ = Cotangent of angle θ = Cotθ
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• $\frac{BC}{CA}$ = $\frac{b}{h}$ = Cosine of angle θ = Cosθ
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• $\frac{CA}{AB}$ = $\frac{h}{p}$ = Cosecant of angle θ = Cosecθ
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• $\frac{CA}{BC}$ = $\frac{h}{b}$ = Secant of angle θ = Secθ
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