Trigonometry Formulas & Calculators
Understand trigonometry formulas with explanations, examples and interactive tools.
Trigonometry
Sine Ratio
\(\sin\theta=\frac{\text{opposite}}{\text{hypotenuse}}\)
Right triangle definition for acute angle θ.
Open calculator →TrigonometryCosine Ratio
\(\cos\theta=\frac{\text{adjacent}}{\text{hypotenuse}}\)
Right triangle definition for acute angle θ.
Open calculator →TrigonometryTangent Ratio
\(\tan\theta=\frac{\text{opposite}}{\text{adjacent}}\)
Right triangle definition when adjacent is nonzero.
Open calculator →TrigonometryPythagorean Identity
\(\sin^2\theta+\cos^2\theta=1\)
Fundamental identity for all real angles.
Learn formula →TrigonometryTangent Identity
\(1+\tan^2\theta=\sec^2\theta\)
Where tangent and secant are defined.
Learn formula →TrigonometrySine Rule
\(\frac a{\sin A}=\frac b{\sin B}=\frac c{\sin C}\)
Relates triangle sides to their opposite angles.
Learn formula →TrigonometryCosine Rule
\(c^2=a^2+b^2-2ab\cos C\)
Find third side using included angle.
Open calculator →TrigonometryDegree to Radian
\(rad=deg\times\frac\pi{180}\)
Convert angle degrees to radians.
Open calculator →TrigonometryRadian to Degree
\(deg=rad\times\frac{180}\pi\)
Convert radians to degrees.
Open calculator →No matching formulas.