sin(1/2*120°)=(1/2*3)/AC
sin60°=1,5/AC
√3 /2=3/2* 1/AC
√3AC=3
AC=√3
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sin(1/2*120°)=(1/2*3)/AC
sin60°=1,5/AC
√3 /2=3/2* 1/AC
√3AC=3
AC=√3