Law of sines calculator
Relate sides and opposite angles with a/sin(A) = b/sin(B) = c/sin(C).
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Law of sines calculator: how it works
Practical information to understand the result and use this tool correctly.
About Law of sines calculator
The law of sines states that each side over the sine of its opposite angle is constant.
Provide side a with angle A, then either side b or angle B.
When SSA data allow two triangles, both candidate angles are listed.
How to use it
- 1Enter side a and angle A in degrees.
- 2Add either side b or angle B.
- 3Calculate the unknown and the ratio a/sin(A).
Frequently asked questions
- Ambiguous SSA?
- Two sides and a non-included angle can yield zero, one, or two triangles.
- Angle unit?
- Degrees between 0 and 180 exclusive.