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Triangle Calculator

Free online triangle calculator tool.

What Is a Triangle Calculator?

The Triangle Area Calculator computes the 2D surface area of any triangle when given the base and the corresponding height. Triangles are the most fundamental geometric shapes, heavily utilized in architecture, engineering, and computer graphics. This free online tool is useful for triangle area calculator, triangle area formula calculator. Common use cases include geometry homework, construction, architecture, engineering, and calculating triangle area from base and height. It is designed for quick browser-based calculations and is suitable for homework, programming, study, everyday math, and checking results.

How to Use This Triangle Calculator

  1. 1
    Enter BaseType the first required measurement.
  2. 2
    Enter perpendicular heightType the perpendicular or corresponding measurement required by the formula.
  3. 3
    CalculateThe tool applies the standard geometry formula.
  4. 4
    Review the AreaThe result is displayed immediately.
  5. 5
    Check UnitsKeep all input measurements in compatible units.

Frequently Asked Questions

No, any of the three sides can act as the base. However, the height MUST be the perpendicular distance from your chosen base to the opposite corner.
If you only know the three sides (a,b,c), you must use Heron's formula. This specific tool requires base and height.
Yes! For a right triangle, the two sides that form the 90-degree angle act perfectly as the base and the height.