Trigonometric Ratios Calculator

Trigonometric RatioAbbreviationDefinitionReciprocal RatioReciprocal Abbreviation
Sinesin(θ)Opposite/HypotenuseCosecantcsc(θ) = 1/sin(θ)
Cosinecos(θ)Adjacent/HypotenuseSecantsec(θ) = 1/cos(θ)
Tangenttan(θ)Opposite/AdjacentCotangentcot(θ) = 1/tan(θ)
Cosecantcsc(θ)1/sin(θ)Sinesin(θ) = 1/csc(θ)
Secantsec(θ)1/cos(θ)Cosinecos(θ) = 1/sec(θ)
Cotangentcot(θ)1/tan(θ)Tangenttan(θ) = 1/cot(θ)
Additional Properties
  • Pythagorean Identity:
    • sin²(θ) + cos²(θ) = 1
    • sec²(θ) - tan²(θ) = 1
    • csc²(θ) - cot²(θ) = 1
  • Reciprocal Identities:
    • sin(θ) = 1/csc(θ)
    • cos(θ) = 1/sec(θ)
    • tan(θ) = 1/cot(θ)
  • Quotient Identities:
    • tan(θ) = sin(θ) / cos(θ)
    • cot(θ) = cos(θ) / sin(θ)
  • Even-Odd Identities:
    • sin(-θ) = -sin(θ)
    • cos(-θ) = cos(θ)
    • tan(-θ) = -tan(θ)
  • Cofunction Identities:
    • sin(90° - θ) = cos(θ)
    • cos(90° - θ) = sin(θ)
    • tan(90° - θ) = 1/tan(θ)

The trigonometric ratios calculator is a useful math tool for finding the values of trigonometric functions given any acute angle. It is based on using right triangle definitions to compute sine, cosine, tangent, cotangent, secant and cosecant.


The calculator implements the following fundamental trigonometric ratios:

sin(θ) = Opposite / Hypotenuse

cos(θ) = Adjacent / Hypotenuse

tan(θ) = Opposite / Adjacent

cot(θ) = Adjacent / Opposite

sec(θ) = Hypotenuse / Adjacent

csc(θ) = Hypotenuse / Opposite

Where θ is an acute angle in a right triangle.

These ratios relate the lengths of triangle sides to trig function values.


Key features of the calculator:

  • Finds trig ratios given angle in degrees
  • Handles angles from 0 to 89 degrees
  • Outputs sine, cosine, tangent, cotangent, secant, cosecant
  • Visual representation of triangle
  • Steps through ratio calculations
  • Supports radians mode
  • Validates inputs


Benefits of using the trig ratios calculator:

  • Quickly find trig values for any acute angle
  • Avoid memorizing trig ratios table
  • Build intuition for trigonometric functions
  • Help visualize right triangle definitions
  • Useful for solving homework problems
  • Handy reference tool


Typical applications include:

  • Studying trig identities and equations
  • Solving triangles using laws of sines and cosines
  • Modeling periodic waveforms
  • Angles calculations in engineering
  • Navigational and surveying computations
  • Physics and geometry problems


The trigonometric ratios calculator provides an easy way to find sine, cosine, tangent and other trig values for any angle based on right triangle geometry. By automating the ratio calculations, it helps gain insights into trigonometric functions and how they relate to triangles. The tool can aid both students and professionals across many technical fields.


  1. Larson, R., & Edwards, B. H. (2013). Calculus (10th ed.). Boston, MA: Brooks Cole.
  2. Redmond, G. (2019). Surveying Mathematics Simplified. Boca Raton, FL: CRC Press.
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