Triangle Area Calculator
Calculate triangle area using base and height, three sides (Heron formula), or vertex coordinates. Shows formulas used.
How to Use Triangle Area Calculator
The Triangle Area Calculator supports three methods for computing triangle area. Use Base & Height for the simplest calculation (½ × base × height). Use 3 Sides with Heron formula when you know all side lengths — it validates the triangle inequality before calculating. Use Coordinates when you have vertex positions on a plane — it uses the shoelace formula. Each method shows the formula and step-by-step calculation. The tool validates inputs and warns about impossible triangles or collinear points. Perfect for geometry homework, land surveying, engineering, and architectural calculations.
Step-by-Step Instructions
- Choose a calculation method: Base & Height, 3 Sides, or Coordinates
- Enter the required values for your chosen method
- Click Calculate Area to see the result
- View the area and formula used in the calculation
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