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27.000=1/3.90
27.000=30.
27000/30=
900=
=s
30=s
27.000 = 1/3 x luas alas x 90
27.000 = luas alas x 30
luas alas = 27.000 / 30
luas alas = 900
s² = 900
s = √900
s = 30 cm
semoga membantu ya :)