# Law of Cosines Calculator

> Solve any triangle using c² = a² + b² − 2ab·cos(C) with SAS and SSS cases.

**URL:** https://www.calculatoranswers.com/law-of-cosines-calculator
**Category:** Education

## Quick Answer

Solve missing side lengths and angles of a triangle using the Law of Cosines. Supports SAS and SSS inputs with step-by-step math.

## Definition

A Law of Cosines calculator is a mathematical tool that solves oblique or right triangles using the generalized Pythagorean theorem: c² = a² + b² − 2ab·cos(C). Given two sides and their included angle (SAS) or all three side lengths (SSS), it calculates the remaining side length and all unknown interior angles.

## How to Use

1. **Choose your input case** — Select either SAS (Side-Angle-Side) or SSS (Side-Side-Side) depending on your known measurements.
2. **Enter known measurements** — Type the values for your known side lengths and/or angles (angles should be in degrees).
3. **Read the triangle solution** — View the calculated side lengths, interior angles, perimeter, area, and step-by-step math.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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