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Penjelasan dengan langkah-langkah:

28. V 1/2 air = 1/2 x r x r x r

= 1/2 x 110cm x 110cm x110cm

= 665.500 cm3

= 665,5 liter

29. V air = r x r x t.air dalam bak

= 4m x 4m x 3m

= 48 m3

= 48.000 liter

30.V air = 1/2 Vol kolam

= 1/2 x px l x t

= 1/2 x 8m x 6m x 1,5m

= 1/2 x 72 m3

= 36 m3

= 36.000 liter