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P x L = Luas alas
4x * 3x = 300
12x² = 300
x² = 300/12 = 25
x =√25 = 5
p= 4x=4(5)= 20
L= 3x=3(5)= 15
t = 2x = 2(5)= 10
Vol = PxLxT = 300 x 10 = 3.000cm³