Triangle Calculator
Triangle modes cover law of cosines/sines and right-triangle Pythagorean cases.
Limitation: Educational geometry.
How to Use the Triangle Calculator
Triangle modes cover law of cosines/sines and right-triangle Pythagorean cases.
Open the Triangle calculator and read field labels.
Match the mode
Educational geometry.
What It Calculates
Triangle modes cover law of cosines/sines and right-triangle Pythagorean cases.
Worked Examples
SSS 3-4-5
Inputs
Result
Right 3-4-5 triangle; area 6.
Right legs 3 & 4
Inputs
Result
Hypotenuse √(9+16) = 5.
SAS sides 5,7 angle 60°
Inputs
Result
Uses law of cosines for third side.
Check your mode
Educational geometry.
Frequently Asked Questions
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Try the CalculatorFormulas
Standard definitions with assumptions noted below.
Formula
Scientific Background
Standard geometry definitions with assumptions stated on-page. Educational only—not professional certification.
Sources & review
Triangle Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.
Last reviewed
July 22, 2026
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