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From wikipedia:
The law of cosines generalizes Pythagoras' theorem, which holds only for right triangles: if the angle $\gamma$ is a right angle (of measure 90° or $\pi/2$ radians), then $\cos(\gamma)~=~0,$ and thus the law of cosines reduces to Pythagoras' theorem:
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PythagorasTheorem Radian 

(none)  (none)  ComplexConjugate ComplexPlane DifferenceOfTwoSquares Euler PolarRepresentationOfAComplexNumber Pythagoras UnitCircle 
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