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= 11 (300 + 240 + 160)
= 11 (700)
= 7700 cm2
volume kaleng cat = pi R2. T = 22/7 . 72. 10 = 1540 cm3banyak kaleng cat = 7700 / (1540.2) = 7700 / 3080 = 2,5 kaleng cat