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450 = 1/3 * luas alas * 15
450 = 5 * luas alas
luas alas = 450 / 5
luas alas = 90 cm²
450 = 1/3 * luas alas * 15
450 = 5 * luas alas
luas alas = 450 / 5
luas alas = 90 cm^2