Ответ:
A+B+C+D=360
D, B, C-x
3x=360-120
X=240/3
X=80
B=80
C=80
D=80
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Ответ:
A+B+C+D=360
D, B, C-x
3x=360-120
X=240/3
X=80
B=80
C=80
D=80
∠a = 120°
360° - 120° = 240° - ∠b + ∠c + ∠d
240° / 3 = 80°
Ответ: ∠b = ∠c = ∠d = 80°