Hauv phau ntawv qhia ntxaws ntxaws no, peb yuav tshawb xyuas cov txheej txheem tsim khoom ntawm lub raj octagonal rau lub qhov rooj kaw. Cov ntsiab lus tseem ceeb hauv cov txheej txheem no suav nrog cov tshuab txias yob txoj kev tshuab, cov raj octagonal, cov kav dej octagonal, thiab lub qhov rooj kaw qhov rooj tseem ceeb. Yog li, cia peb delve rau hauv cov kauj ruam-by-...
Nyeem ntxiv