Assertion: octahedron's projection | /r/HasProperty | centered on face
Facets:
Source sentences:
text: The icosahedron has three special orthogonal projections, centered on a face, an edge and a vertex:
text: The octahedron has four special orthogonal projections, centered, on an edge, vertex, face, and normal to a face.
text: The octahedron has four special orthogonal projections, centered, on an edge, vertex, face, and normal to a face.