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r = 1/2 × 14 cm
r = 7 cm
Lp tanpa tutup = 594
π × r² + 2 × π × r × t = 594
22/7 × 7² + 2 × 22/7 × 7 × t = 594
154 + 44t = 594
44t = 594 - 154
44t = 440
t = 440 : 44
t = 10 cm