Resposta:
Explicação passo-a-passo:
Lei dos senos
a)
X/sen x = y / sen y
X/ sen 60 = 5\/2 / sen 45
X / \/3/2 = 5\/2 / \/2/2
X. 2 / \/3 = 5\/2 . 2 / \/2
2x / \/3 = 10 \/2 / \/2
2x / \/3 = 10
2x = 10 \/3
X = 10 \/3 / 2
X = 5 \/3
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B)
8/sen 45 = x / sen 30
8 / \/2/2 = x / 1/2
8. 2/ \/2 = x . 2
16/ \/2 = 2.x (:2)
8 / \/2 = x
X = 8 / \/2 . \/2 / \/2
X = 8\/2 / 2
X = 4 \/2
