Calculateur de Law of Cosines
Calculate the third side of a triangle using the Law of Cosines from two sides and the included angle.
Formula and method
This calculator computes Side c directly in your browser without sending data to an external server.
Mathematical formula
- Side c:
√(a × a+b × b-2 × a × b × Math.cos(angleCDeg × π ÷ 180))
Variables and parameters
- Side a (a): default value 7.
- Side b (b): default value 10.
- Included angle C (angleCDeg): default value 45 deg.
Some formulas are undefined for certain input combinations (such as division by zero or logarithms of non-positive numbers). In those cases the live tool displays an alert instead of NaN.
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on SpecWhale.
Frequently asked questions
What equation and variables does Law of Cosines Calculator use?
Law of Cosines Calculator evaluates outputs such as <strong>Side c</strong> based on inputs including Side a, Side b, Included angle C. Check the Mathematical Method section for the explicit formula.
What happens if I enter invalid or zero values into Law of Cosines Calculator?
If an input combination is mathematically undefined (such as division by zero or negative square roots), SpecWhale alerts you gracefully rather than returning invalid NaN outputs.
Are my calculations in Law of Cosines Calculator saved or private?
All calculations are 100% private and run locally in your Web browser. Your numbers are never uploaded to any server, but can be saved locally to your device or exported as CSV/JSON.
Is Law of Cosines Calculator free to use?
Yes. Law of Cosines Calculator is completely free, has no usage limit, and does not require an account, email, or API key.
Does Law of Cosines Calculator store or upload my data?
No. Law of Cosines Calculator calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Law of Cosines Calculator?
Law of Cosines Calculator uses a standard formula (see the Method section above for the exact expression). For high-stakes financial, medical, or legal decisions, confirm the result with a professional or an authoritative source before relying on it.
Can I embed Law of Cosines Calculator on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Law of Cosines Calculator to your own blog post or page.