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5/0,5 = 8/sinβ
sinβ = 4/5
β = 12'
<C = 180 - 12 - 30
= 138'
Luas segitiga = 1/2 . a . b . sinC
= 1/2 . 8 . 5 . sin138
= 20 . 0,67
= 13,4
= 1/2 . 8 . 5 . sin138
= 20 . 0,6 = 13,4