Triangle Calculator
Calculate triangle properties including area, sides, angles, perimeter, and triangle type
Area Calculation
Calculate triangle area using different methods
About Triangles
Triangle Types by Sides
- Equilateral: All sides equal
- Isosceles: Two sides equal
- Scalene: All sides different
Triangle Types by Angles
- Right: One 90° angle
- Acute: All angles < 90°
- Obtuse: One angle > 90°
Key Formulas
- Area (base×height): ½ × b × h
- Heron's Formula: √[s(s-a)(s-b)(s-c)]
- Law of Cosines: c² = a² + b² - 2ab·cos(C)
Triangle Inequality
- Sum of any two sides must be greater than the third side
- a + b > c, b + c > a, c + a > b