Trigonometry Calculator

Math

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Solves for missing sides or angles in a right-angled triangle using trigonometric functions (sine, cosine, tangent).

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How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Side a (Opposite), Side b (Adjacent), and Angle C (Hypotenuse) in the units shown.

Step 2

Read Angle A, Side c (Hypotenuse), and Angle B in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

3-4-5 Triangle

Side a (Opposite): 3 units; Side b (Adjacent): 4 units; Angle C (Hypotenuse): 90 degrees

Angle A: 36.87 degrees; Side c (Hypotenuse): 5 units; Angle B: 53.13 degrees

5-12-13 Triangle

Side a (Opposite): 5 units; Side b (Adjacent): 12 units; Angle C (Hypotenuse): 90 degrees

Angle A: 22.62 degrees; Side c (Hypotenuse): 13 units; Angle B: 67.38 degrees

30-60-90 Triangle

Side a (Opposite): 1 units; Side b (Adjacent): 1.732 units; Angle C (Hypotenuse): 90 degrees

Angle A: 30 degrees; Side c (Hypotenuse): 1.999956 units; Angle B: 60 degrees

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