∠D+∠E=70"
∠F = 180" - ( ∠D+∠E ) = 180" - 70" = 110"
∠E+∠F= 150"
∠D=180" - ( ∠E+∠F ) = 180" - 150" = 30"
∠D+∠E=70" =>∠E = 70" - ∠D = 70" - 30" = 40"
ответ: ∠E=40"; ∠D= 30"; ∠F = 110"
∠D+∠E=70"
∠F = 180" - ( ∠D+∠E ) = 180" - 70" = 110"
∠E+∠F= 150"
∠D=180" - ( ∠E+∠F ) = 180" - 150" = 30"
∠D+∠E=70" =>∠E = 70" - ∠D = 70" - 30" = 40"
ответ: ∠E=40"; ∠D= 30"; ∠F = 110"