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en un triángulo, la suma de sus ángulo son:
180° = α + β + ω
en un triángulo isósceles, 2 ángulos son iguales y uno desigual:
α = β
ω = 40°
180° = α + α + 40°
180° - 40° = 2α
140° / 2 = α
α = 70° = β