Ответ:
ВСА=180-140=40°
3Х+4Х+40=180
7Х=140
Х=20
А=60°
В=80°
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Ответ:
ВСА=180-140=40°
3Х+4Х+40=180
7Х=140
Х=20
А=60°
В=80°