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Itu benar-benar mudah. Lebar plastik jelas terkait dengan lingkaran plastik es lilin. Ada hubungan antara jari-jari plastik dan volumenya berdasarkan fakta bahwa keliling lingaran dua kali lebar kantong plastik. Selama asumsi bahwa ujung plastik yang tidak bolong itu dapat melar mengikuti lingkaran ...
