"SIO_000503" . _:vb50934806 . _:vb50934806 . "A polygonal face is a polygon bounded by a circuit of polygon edges, and includes the flat (plane) region inside the boundary."@en . "polygonal face"@en . _:vb50934806 . . . _:vb50934806 ":arcc045b249" . . . _:vb50934806 . _:vb50934806 .