Triangle Calculator
Calculate triangle properties from sides, angles, height, or area. Get all measurements, see a visual representation, and learn about triangle theory!
Choose Calculation Method
Currently using: 3 Sides (SSS) — Calculates all triangle properties given the three sides.
Triangle Types, Properties, and Formulas
- Scalene: All sides and angles are different.
- Isosceles: Two sides are equal and so are their opposite angles.
- Equilateral: All sides and angles are equal (each angle = 60°).
- Right: One angle is 90°; Pythagorean Theorem applies.
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Area Formulae:
- From sides a, b, c: Area = √[s(s-a)(s-b)(s-c)] (Heron's Formula), where s = (a+b+c)/2
- From base and height: Area = (base × height) / 2
- With sides and angle: Area = (ab sin C)/2 or equivalents
Useful Laws:
- Law of Sines: a/sin A = b/sin B = c/sin C
- Law of Cosines: c² = a² + b² - 2ab cos C
Learn more about Triangles on Wikipedia