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B=180°-58°
B=122°
b.- B+30°= 90°
B= 90°-30°
B= 60°
c.- 3B= 180°
B= 180°/3
B= 60°
d.- B+67°= 90°
B= 90°-67°
B= 23°
e.- 50°+90°+B= 180°
140°+B= 180°
B= 180°-140°
B= 40°
f.- 72+35+B= 180°
107°+B= 180°
B= 180°-107°
B= 73°
Espero que te halla ayudado :D