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acá esta la ecuación...
4β° = 180° - β°
5β° = 180°
β° = 36°
180° - 36°= 144°
El ángulo es 144°
Comprobamos...
180° - 144° = 36° × 4 = 144°
Espero haberte ayudado, si tienes dudas pregunta =D
x = 4Sx
x = 4(180°-x )
x = 720° - 4x
x+4x = 720°
5x = 720°
x =720°/5
x =144°