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V 3 bola = 3 .4/3 .π r³ = 4. π (3,5)³
V 3 bola = V pertambahan air di tabung
4π (3,5)³ = π (7)² t
4 (3,5)³ = (7)² t
t = 4 . (3,5) (3,5) (3,5) / (7 . 7)
t = 3,5
jadi:
- tinggi air bertambah 3,5 cm ..
- tinggi air menjadi = 21 + 3,5 = 24,5 cm
moga ngerti