单词	octagon
释义	octagonoctagon /ˈɑktəˌgɑn/ noun [countable] Etymology ETYMOLOGYoctagon Origin: 1500-1600 Latin octagonum, from Greek, from okta- eight + -gonon -gon math, geometry a flat shape with eight sides—octagonal /ɑkˈtægənl/ adjective:  an octagonal room
随便看	triangle inequality theorem triangular triangular trade triangulation Triassic triathlete triathlon tribal tribalism tribe tribesman tribeswoman tribulation tribunal tribune tributary tribute trice triceps trick tricked out trickery trickily trickiness trickle

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