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1540 = 22/7 x r² x t (keduanya dibagi 22/7)
490 = r² x t
t = 490/49 = 10 cm
1540 = 22 / 7 x 7² x t
1540 = 22 x 7 x t
1540 = 154 x t
t = 1540 / 154
t = 10 cm