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BOD=x+y
AOC=x+z
BOD+AOC=135
2x+y+z=135
x+y+z=100
reemplazamos:
x+100=135
x=35
espero haberte ayudado
m∡CD=z
(y+x)+(x+y)=135°
135°=x+y+z
y+x+z+80°=180°
Reemplazamos:
135°-x+80°=180°
x=215°-180°
x=35°