Triangle Solver
Free online triangle solver. All triangle parameters (sides, angles, area). Accurate and easy to use.
Triangle Inputs
Solution (SSS)
Sides
a = 5.0000
b = 6.0000
c = 7.0000
Angles
A = 44.42°
B = 57.12°
C = 78.46°
Area: 14.6969
Perimeter: 18.0000
Semi-perimeter: 9.0000
Type: Scalene & Acute
Steps
Using Law of Cosines: cos(A) = (b² + c² − a²) / (2bc)
cos(A) = (6² + 7² − 5²) / (2 × 6 × 7)
cos(A) = (36 + 49 − 25) / 84
cos(A) = 0.7142857142857143
A = 44.42°
Same for B, then C = 180 − A − B
Embed this tool
Copy and paste the code below into your website to embed this tool for free. An attribution link to The Util Box is required.
<iframe src="https://www.theutilbox.org/embed/triangle-solver" width="600" height="500" frameborder="0" style="border: none; max-width: 100%;" title="Free triangle solver tool from The Util Box"></iframe>