Triangle Calculator
Calculate triangle area, perimeter, angles, and missing sides using various methods and formulas
Triangle Calculator
Three Sides (SSS)
Results
Enter triangle measurements to see calculations.
Triangle Properties
Understanding Triangles
Triangle Types
Triangles are classified by sides (equilateral, isosceles, scalene) and by angles (acute, right, obtuse). Each type has unique properties.
Area Formulas
Various formulas exist: base×height/2, Heron's formula for three sides, and SAS formula using two sides and included angle.
Law of Cosines
c² = a² + b² - 2ab cos(C). Used to find unknown sides or angles when you know two sides and included angle.
Law of Sines
a/sin(A) = b/sin(B) = c/sin(C). Useful for solving triangles when you know two angles and one side.
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