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V = PLT
= (12)(20)(3,8)
= 912 m³
Lalu kurangkan dengan volume yang bolongnya
P = 12 - (0,4 + 0,4)
= 12 - 0,8
= 11,2 m
P = 20 m
T = 3,8 - (0,4 + 0,4)
= 3,8 - 0,8
= 3 m
V = PLT
V = (11,2)(20)(3)
= 672
V = 912 - 672
= 240 m³