∠3=∠1=43° ( верт.)
∠2+∠4=180°-∠1+∠3
∠2=∠4 (верт.)
2∠2=180°-2∠3
2∠2=360°-43°*2=274°
∠2=274:2=137°
Ответ ∠1=∠3=43° ∠2=∠4=137°
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∠3=∠1=43° ( верт.)
∠2+∠4=180°-∠1+∠3
∠2=∠4 (верт.)
2∠2=180°-2∠3
2∠2=360°-43°*2=274°
∠2=274:2=137°
Ответ ∠1=∠3=43° ∠2=∠4=137°