Assertion: prism's base | /r/HasProperty | rectangle
Facets:
Source sentences:
text: The bases can be a triangle, square, rectangle or any other polygon.
text: A rectangular prism would have bases that are rectangles.
text: The faces are always rectangles on prisms, so if it's a triangular prism the bases are triangles; if it's a rectangular prism, the bases are rectangles; if it's a hexagonal prism, the bases are hexagons.