Law of Cosines Side Calculator for formula verification for 2D and 3D geometry work 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.
c^2 = a^2 + b^2 - 2ab cos(C)Use the two known sides and the included angle to solve for the third side.
The angle should be the one between the two known sides.
Keep more precision when the output will feed another formula, drawing, coordinate step, or comparison rather than being rounded once and left alone.