Frequently Asked Questions
Everything you need to know about the Law of Sines Calculator.
What is the Law of Sines?
A relationship in any triangle: a/sin A = b/sin B = c/sin C, used to solve for unknown sides and angles.
What data do I need?
ASA, AAS, or SSA (two sides and a non-included angle) — pick the mode matching what you know.
What is the ambiguous case?
In SSA, depending on the numbers, there can be 0, 1, or 2 valid triangles; this calculator detects and shows all valid solutions.
Why does it show two answers sometimes?
Because your SSA inputs allow two different triangles — both are shown labelled Triangle 1 and Triangle 2.
What if there's no valid triangle?
The calculator explains clearly why (e.g. the side given is too short), rather than showing an error.
Does it show the steps?
Yes, the Law of Sines setup and algebra are shown with your actual numbers.
Does it calculate area?
Yes, for each valid solution.
Can I switch between degrees and radians?
Yes, a toggle updates all values.
Is it free?
Completely free, no sign-up or limits.
Does it work on mobile?
Yes, fully responsive.