https://w3id.org/framester/conceptnet5/data/en/quadrangle.n.geometry

<https://w3id.org/framester/conceptnet5/data/en/gon>
<https://w3id.org/framester/conceptnet5/data/en/quadrilateral>
<https://w3id.org/framester/conceptnet5/data/en/tetragon>

risorse dalla linked data cloud