Law of Cosines Angle Calculator for coordinate geometry, angles, and diagram-based problems when you want a fixed formula answer without improvising the math by hand.
Informational calculator only. Verify important outputs independently before legal, tax, medical, engineering, safety-critical, contractual, employment, or compliance use.
Enter job values, review the estimate, then use the decision hints before ordering or quoting.
cos(C) = (a^2 + b^2 - c^2) / 2abSolve for the cosine first, then take the inverse cosine to recover the angle.
This works when all three side lengths are known.
Keep more precision when the output will feed another formula, drawing, coordinate step, or comparison rather than being rounded once and left alone.