AB^2=AC^2+BC^2-2*AC*BC*cosC Возьмем АС=ВС за Х 3=X^2 + X^2 - 2* X^2 *cos120 3=3*X^2 X^2=1 X=1=ACОтвет:АС=1
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AB^2=AC^2+BC^2-2*AC*BC*cosC
Возьмем АС=ВС за Х
3=X^2 + X^2 - 2* X^2 *cos120
3=3*X^2
X^2=1
X=1=AC
Ответ:АС=1