ລູກບາດ
ລູກບາດ ແມ່ນຮູບຊົງສາມມິຕິທີ່ມີ 6 ໜ້າ ແລະມີມຸມ 8 ມຸມ ເສັ້ນຜ່າສູນກາງຂອງລູກບາດມີຄ່າເທົ່າກັບຮາກທີສາມຂອງສາມ
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