Enter the known measurements; all results update as you type, with the formula and steps.
Formula
a / sin A = b / sin B = c / sin C
Worked example
A = 40°, B = 60°, a = 7: b = 9.43, c = 10.72.
Frequently asked questions
When do I use the law of sines?
When you know two angles and a side, or two sides and a non-included angle.
What is the ambiguous case?
Two sides and a non-included angle can give two triangles.
Which unit for angles?
Degrees.
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Results are estimates for information only. Check important figures with a professional.