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628 = 2 x 3,14 x r x 10
628 = 62,8r
r = 10 cm
V.tabung= phi x r^2 x t
= 3,14 x 10^2 x 10
= 3.140 cm3
maaf kalo jawabannya salah
628 cm² = 2x3,14xrx10
628 cm² = 62,8xr
r = 628/62,8
r = 10
volume = πr²t
= 3,14x10²x10
= 3140 cm³