АС =140
СВД = 140
А=70
С=70
<СВД=180-<АВС=180-40=140°
<А=С (по св.)=<СВД:2=140:2=70°
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АС =140
СВД = 140
А=70
С=70
<СВД=180-<АВС=180-40=140°
<А=С (по св.)=<СВД:2=140:2=70°