Trigonometry · Classes 9, 10, 11
Cosine Ratio
Right triangle definition for acute angle θ.
FORMULA
\(\cos\theta=\frac{\text{adjacent}}{\text{hypotenuse}}\)
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Worked example
Adjacent 4, hypotenuse 5 ⇒ cos θ=0.8
Understand this formula
Right triangle definition for acute angle θ.
Check measurement units, mathematical domains and rounding before applying any result in an examination.