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diisi 3/5
Dit = Banyak air di akuarium
Jawab = V = r³
= 20³
= 8000 cm³
Banyak air = 3/5 × 8000
= 4.800 cm³ ( B )
28. V = 1.2×a×b×t
= 1/2 × 6 × 8 ×15
= 360 cm³ ( c )