4.620 = 1/3 x 22/7 x 212 x t
4.620 = 1/3 x 22/7 x 441 x t
4.620 = 1/3 x 22 x 63 x t
4.620 = 22 x 21 x t
4.620 = 462 x t
t = 4.620/462
t = 10 cm
Jadi, tinggi topi ulang tahun tersebut adalah 10 cm.
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