N'ihe dị ka n'afọ 1596, onye na-agụ ihe gbasara mgbakọ na mwepụ nke Wei Kingdom bụ Liu Hui mepụtara algorithm iterative nke dabeere na polygon wee jiri ya na polygon nwere akụkụ 3,072 iji nweta uru nke π nke 3.1416. N'ihe dị ka n'afọ 1595, onye na-agụ ihe gbasara mgbakọ na mwepụ nke French bụ Liu Hui mepụtara ụzọ dị ngwa nke ịgbakọ π wee nweta uru nke 3.14 site na polygon nwere akụkụ 96, site na iji eziokwu ahụ bụ na ọdịiche dị na mpaghara nke polygons na-aga n'ihu na-etolite usoro geometric nwere ọnụọgụ nke 4.
9 ihe