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Ángulo complementario: β
α - β = β/4
4α-4β = β
4α-5β = 0° (I)
Los ángulos complementarios suman 90°
α+β = 90°
4α+4β = 360°
-4α-4β = -360° (II)
De sumar (I) y (II):
4α-5β = 0°
-4α-4β = -360°
---------------------------
-9β = -360°
9β = 360°
β = 40°
Ángulo complementario: β=40°
Ángulo: α=50°
Respuesta: 50°