Assertion: octagon | /r/HasProperty | 8 sided 2-d shape
Facets:
value: by mathematical definition
type: OTHER
Source sentences:
text: Hi Phil, By mathematical definition, an octagon is an 8 sided 2-D shape.
text: An octagon is an 8 sided 2-D shape but in describing the 3-D "stop sign" shape (I drew one below that is thick enough that you can see the third dimension) mathematicians use the terms vertices, edges and faces.