English
简体中文
繁體中文
日本語
Русский
🔺 Triangle Calculator
Input Method
Three Sides (SSS)
Two Sides and Included Angle (SAS)
One Side and Two Angles (ASA/AAS)
Right-Angled Triangle (a, b)
Side a (opposite angle A)
Side b (opposite angle B)
Side c (opposite angle C)
Angle A (degrees)
Angle B (degrees)
Angle C (degrees)
Precision (decimal places)
Load Sample
Clear
Calculate Triangle
Triangle Visualization
Triangle Type
--
Side Lengths
Side a
--
Side b
--
Side c
--
Angles (degrees)
Angle A
--
Angle B
--
Angle C
--
Other Properties
Perimeter
--
Area
--
Semiperimeter
--
Inradius
--
Circumradius
--
Notes:
The sum of any two sides must be greater than the third side (triangle inequality)
The sum of all angles in a triangle is always 180 degrees
Right-angled triangle calculator assumes angle C is 90 degrees
Uses the Law of Cosines and Law of Sines for calculations
Area is calculated using Heron's formula for SSS input