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72 = 4s
S = 72/4
S = 18
volume limas = 1/3 x luas alas x tinggi
= 1/3 x 18 x 18 x 15
= 1620 cm3
72 = 4S
S = 18
L Alas = SxS
L Alas = 18 x18 =324 cm²
V = 1/3 xLAx T
V = 1/3 x 324 x 15
V = 1620 cm³