Cevap:
ABC YE 2X
DAB YE 2Y DERSEK
[tex]x + y + 65 = 180 \\ x + y = 115 \\ 2x + 2y + 80 + dcb = 360 \\ 2(x + y) + 80 + dcb = 360 \\ 2 \times 115 + 80 + dcb = 360 \\ 310 + dcb = 360 \\ dcb = 50[/tex]
