За теоремою косинусов:
BC^2= AB^2 + AC^2 - 2*AB*AC*cos120*= 49+64 + 16*7*0.5=113+56=169
BC = √169 = 13
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За теоремою косинусов:
BC^2= AB^2 + AC^2 - 2*AB*AC*cos120*= 49+64 + 16*7*0.5=113+56=169
BC = √169 = 13