Cosine Rule Calculator
Calculate the unknown side or angle of a triangle using the cosine rule. Enter two sides and the included angle to find the third side, or three sides to find an angle.
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How to use this tool?
- 1 Enter the requested data in the fields above carefully.
- 2 Click the calculate button to process the information instantly.
- 3 Analyze the detailed result and the formula explanation presented below.
- 4 You can print, share, or even embed the calculator on your own site for free.
Unlike traditional static calculators, our tools adapt to specific user needs. They include detailed explanations of the formulas used, ensuring transparency in results. Furthermore, our design is focused on user experience, eliminating distractions and focusing on what really matters: your data and conclusions.
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Frequently Asked Questions
The cosine rule relates the lengths of the sides of a triangle to the cosine of one of its angles. It is used to find a side when two sides and the included angle are known, or an angle when three sides are known.
To find a side, enter two sides and the included angle (in degrees). To find an angle, enter all three sides.
Yes, as long as the inputs satisfy the triangle inequality (for SSS) or the angle is between 0 and 180 degrees (for SSA).
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