Calculator inputs
Calculation history and comparison
Recent calculations are stored only in this browser.
| Date | Method | Adjacent side | Angle | Unit |
|---|---|---|---|---|
| No saved calculations yet. | ||||
Formula used
Adjacent = Hypotenuse × cos(θ) Adjacent = Opposite ÷ tan(θ) Adjacent = √(Hypotenuse² − Opposite²) Adjacent² = a² + b² − 2ab cos(C) Target adjacent = Reference adjacent × Scale factor Horizontal adjacent = Rise ÷ tan(θ) Horizontal adjacent = Rise ÷ (Slope % ÷ 100) Horizontal component = Magnitude × cos(θ)
How to use this calculator
- Select a calculation method or choose automatic detection.
- Select the input and output length units.
- Enter the known side lengths and angle.
- Choose decimal places or significant figures.
- Press the calculation button to view all results.
- Review the formula, validation, diagram, and solution steps.
- Copy, print, share, or export the final calculation.
Example calculations
| Method | Example inputs | Adjacent result | Common use |
|---|---|---|---|
| Hypotenuse and angle | 10 m, 35° | 8.1915 m | Ladder or brace |
| Opposite and angle | 4 m, 30° | 6.9282 m | Surveying |
| Pythagorean theorem | 13 m and 5 m | 12 m | Right triangle |
| Rise and slope | 1.2 m, 8% | 15 m | Road or ramp |
| Similar triangles | 3 m, 2 m, 8 m | 12 m | Indirect measurement |
Common applications
This calculator supports construction, surveying, physics, and geometry. It estimates horizontal distances and triangle sides. Always confirm critical engineering values independently.
Useful examples include ladders, ramps, roofs, braces, vectors, and shadows. Similar triangles support indirect field measurements. Cosine law handles non-right triangles.
Frequently asked questions
What is the adjacent side?
The adjacent side touches the selected reference angle. It excludes the hypotenuse in a right triangle.
Which formula should I choose?
Choose the formula matching your known values. Automatic mode selects the first complete option.
Can this calculator handle non-right triangles?
Yes. Select the law of cosines method. Enter two sides and their included angle.
Can I enter radians or gradians?
Yes. Select the required angle unit. The calculator converts it internally.
Why must the hypotenuse be longest?
The hypotenuse lies opposite the right angle. It is always the longest right-triangle side.
What does slope percentage mean?
Slope percentage equals rise divided by horizontal run. The ratio is multiplied by one hundred.
How are significant figures applied?
The calculator rounds the displayed result only. Internal calculations retain higher precision.
Can I compare several calculations?
Yes. Completed results enter the browser history table. Clear it whenever necessary.
Are these results suitable for engineering work?
They support planning and checking. Qualified professionals should verify safety-critical designs and measurements.
Accuracy and disclaimer
Results depend on entered measurements and selected units. Rounding can change displayed values slightly. Keep extra precision during intermediate work.
This tool provides educational and planning estimates. It does not replace certified engineering analysis. Verify critical dimensions before construction begins.