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r x r x r = 15 x 15 x 15 = 3375 cm kubik
volume limas
1/3 . La . T
1/3 x s x s x T
1/3 x 15 x 15 x 12
225 x 4 = 900 cm kubik
total volume = 3375 + 900 = 4275 cm kubik