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V=πr²t
t=V÷πr²
t=628000÷3,14.100²
t=628000÷31400
t=20 cm
r = 100
t = ?
V = r2t
628000 = 3,14 x 100 x 100 x t
628000 = 314 x 100 x t
628000 / 314 = 100t
2000 = 100 t
t = 2000 / 100
t = 20
maaf kalau salah:)