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a : b : c = 5: 4: 3
Tienen la misma proporción
a = 5k
b = 4k
c = 3k
Suma de ángulos inscritos
A + B + C = 180°
b/2 + c/2 + a/2 = 180°
b + c + a = 360°
12k = 360°
k = 30°
a = 5 × 30 = 150°
b = 4 × 30 = 120°
c = 3 × 30 = 90°