Oblique Triangle Solver (Law of Sines & Cosines)
Solve any triangle using law of sines and cosines with complete angle and side calculations
About this calculator
This oblique triangle solver calculates unknown sides and angles of any triangle using the Law of Sines and Law of Cosines. Perfect for geometry students, engineers, and surveyors, it handles all triangle types including acute, obtuse, and right triangles. Simply input any three known values (combination of sides and angles) and get complete triangle measurements with step-by-step solutions showing which mathematical law was applied.
How to use
Enter any three known triangle measurements: sides (a, b, c) or angles (A, B, C). Ensure you have at least one side measurement. Click calculate to solve for all remaining unknown sides and angles using the appropriate trigonometric laws.
Frequently asked questions
What's the difference between Law of Sines and Law of Cosines?
Law of Sines relates sides to opposite angles, while Law of Cosines relates all three sides to one angle, useful when you know three sides or two sides and included angle.
Can this solve right triangles too?
Yes, this calculator works for all triangle types including right triangles, acute triangles, and obtuse triangles using the same trigonometric principles.
What information do I need to solve a triangle?
You need any three measurements: either three sides (SSS), two sides and an angle (SAS/SSA), or two angles and a side (AAS/ASA).