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2a - β = 12
3α=112
α=34 ----> 34 + β = 90
β = 56
α + β = 90° ....... I
2α - β=12
2α -12 = β .........II
I reemplazo en II
α + β = 90°
α + 2α - 12 = 90°
3α = 90+12
3α = 102
α= 102/3
α = 34°
α + β = 90°
34° + β = 90°
β = 90°-34°
β = 56°