Triangle Solver

Solve any triangle from sides and angles with visual diagrams

SSS (3 sides)

SSS: a=3, b=4, c=5
Side a
3
Side b
4
Side c
5
Angle α
36.8699°
Angle β
53.1301°
Angle γ
90°
Area
6
Perimeter
12
A (36.9°)B (53.1°)C (90°)c=5a=3b=4

About this calculator

Solve any triangle given sides and/or angles using the law of sines and cosines. See the triangle drawn to scale with all sides, angles, area, and perimeter calculated and labeled.

Common examples

  • Sides 3-4-5: right triangle, area = 6
  • Sides 5-5-5: equilateral, angles = 60° each
  • Side 10, angles 45°-90°-45°
  • Sides 7-8-9: scalene triangle
  • Sides 6-6-8: isosceles triangle