Triangle Calculator
Calculate sides, angles, area, and more for any triangle by entering three known values (including at least one side).
Understanding Triangle Calculations
Triangles are fundamental shapes in geometry with three sides and three angles. Every triangle's internal angles sum to 180°.
Key Triangle Properties
- Area: Calculated using base × height ÷ 2 or Heron's formula
- Perimeter: Sum of all three sides
- Pythagorean theorem: For right triangles, a² + b² = c²