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a² = (3.5)² + (2.8)²
a² = 12.25 + 7.84
a² = 20.09
a =√20.09
a = 4.48 m
a = 4.5
senB = co/h
senB = 3.5 / 4.5
senB = 0.77
sen -1B = 51.05
senC = co/h
senC = 2.8/4.5
senC = 0.622...
sen-1C = 38.47