C=√(a²+b²-a*b*cosα)
C=√(4²+8²-4*8*cos120)=√(16+64-32*(-0,5))=8
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C=√(a²+b²-a*b*cosα)
C=√(4²+8²-4*8*cos120)=√(16+64-32*(-0,5))=8