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a+b= 90°
a-b= 20°18´
a+b= 90°
-------------------
2a = 110°18´
a=110°18´/2
a=55°9´
a-b= 20°18´
55°9´-b=20°18´
55°9´=20°18´+b
55°9´- 20°18´=b
b=34°51´
R//El menor angulo mide 34°51´.
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