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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