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r tabung = 7cm
r bola = 5cm
Vol bola3 = 3(4/3π r³)
= (3)4/3 x 3,14 x 5^3
= 1.570
Vol tabung = π r² t
1.570 = 3,14 x 7² x t
1.570 = 153,9 x t
t = 10,2
t = 10,20 cm (tinggi air bola dlm tabung)
Tinggi sekarang = 50 - 10,2 = 39,8 cm