Geometry Tool
Law of Cosines Calculator
Solve triangles using Side-Angle-Side (SAS) or Side-Side-Side (SSS).
Σ The Formula
c² = a² + b² - 2ab cos(C)
Real World Examples
Finding a Length
SAS: Find the side opposite an included angle.
Finding an Angle
SSS: Find any angle if you know all three sides.
# About This Calculator
The Law of Cosines is a generalized form of the Pythagorean Theorem used for non-right triangles.
It relates the lengths of sides to the cosine of one of its angles, making it perfect for SSS (finding angles) and SAS (finding the third side) problems.
Frequently Asked Questions
Is Law of Cosines Calculator free to use?+
Yes, Law of Cosines Calculator on Matheric is completely free to use. We believe in accessible education and utility for everyone.
How accurate is Law of Cosines Calculator?+
We use standard mathematical formulas and high-precision computing algorithms to ensure results for Law of Cosines Calculator are accurate for academic and professional use.
Can I use Law of Cosines Calculator on my phone?+
Yes! Law of Cosines Calculator is fully responsive and optimized for all devices, including smartphones, tablets, and desktops.
Do you save my data?+
No. We prioritize your privacy. All calculations are performed in your browser or temporarily processed, and we do not store your personal input data.
How do I report a bug?+
If you notice any issues with Law of Cosines Calculator or have suggestions for improvement, please contact us via the link in the footer. We value your feedback!
Can I request a new feature?+
Absolutely. We are constantly expanding our toolset. Feel free to reach out with your requests, and we might build it next!
About
The Law of Cosines is a generalized form of the Pythagorean Theorem used for non-right triangles.
It relates the lengths of sides to the cosine of one of its angles, making it perfect for SSS (finding angles) and SAS (finding the third side) problems.