Law of Sines Calculator
Quick answer: Enter two angles and a side (or two sides and an angle) to solve the triangle completely.
Use the Law of Sines (a/sin A = b/sin B = c/sin C) to solve any triangle when you know two angles and a side (AAS or ASA) or two sides and an opposite angle (SSA).
Advertisement
Last reviewed: April 2026Report an error
Side b
12.25
Sides: a=10.00, b=12.25, c=13.66. Angles: A=45.00°, B=60.00°, C=75.00°.
Side a
10.00
Side b
12.25
Side c
13.66
Angle A
45.00°
Angle B
60.00°
Angle C
75.00°
Area
59.15
Advertisement
How to Use This Law of Sines Calculator
- 1Enter known angles (A, B) and at least one side.
- 2The calculator finds all remaining sides, angles, and triangle area.
Frequently Asked Questions
- Use it for AAS (two angles, non-included side), ASA (two angles, included side), or SSA (two sides, non-included angle — "ambiguous case"). Not for SAS or SSS — use Law of Cosines instead.
- a/sin(A) = b/sin(B) = c/sin(C). Each side divided by the sine of its opposite angle gives the same ratio (the circumscribed circle diameter).
Advertisement
Related Calculators
</> Embed this calculator on your website
<iframe src="https://calqpro.com/calculators/law-of-sines-calculator" width="100%" height="600" frameborder="0" title="Calqpro Calculator" loading="lazy"></iframe> <p>Powered by <a href="https://calqpro.com">Calqpro</a></p>
Advertisement