АС= √АВ²+ВС² -2*АВ*ВС*cos130°=
√25+9-30*(--0.6427876096)= √53,283628288= 7.3 cм
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АС= √АВ²+ВС² -2*АВ*ВС*cos130°=
√25+9-30*(--0.6427876096)= √53,283628288= 7.3 cм