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X+X+30 = 90
2X+30 = 90
2X = 90-30
2X = 60
X = 30
Ya tenemos la medida del ángulo X, que es 30°
donde
<A = X+30|
<B =X
<A+<B = 90°
X+30°+X = 90
2X = 90°-30°
2X = 60°
X = 60°/2
X =30|
B =30°
A = 30+30=60°