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V = πr2 x t
dik :
r = 20 cm
t = 40 cm
dit : volume tabung ...?
peny :
V = πr2 x t
= 3,14 . 20² x 40
= 1256 x 40
= 5024 cm³
= 3,14 x 20^2 x 40
= 1256 x 40
= 5024 cm^3