Cosine Calculator
Determine the cosine of an angle or find the angle using the adjacent side and hypotenuse with fully interactive right triangle visualizers.
Trigonometric Inputs
Calculated Values
Understanding the Cosine Trigonometric Ratio
In mathematics, the cosine is a fundamental trigonometric ratio. For an acute angle in a right triangle, it is defined as the ratio of the length of the adjacent side (the side next to the angle) to the length of the hypotenuse (the longest side opposite the right angle).
Using the widely known mnemonic SOH CAH TOA, the CAH stands for Cosine = Adjacent / Hypotenuse.
Unit Compatibility
Supports calculation for angles inputted as either Degrees or Radians, translating smoothly between them on the fly.
Inverse Cosine (Arccos)
If you already have the Adjacent and Hypotenuse values, use the inverse cosine function to find the exact angle: θ = arccos(A / H).
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