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It's kind of obvious seeing as 'oct' means eight... Anyway, there are eight straight lines in an octagon.
Straight.
Octogon
octagon !
Eight straight lines, meeting in pairs at eight vertices.
You can cut a round cake into eight parts with three cuts, but you can't cut a circle into eight parts with three straight lines.
Octogon. Eight sides, think of OCTOpus which has eight legs.
Eight Straight.
There is no specific name for such a shape.
1949 Buick Eight Road Master Convertable
An octagon.