Assertion: triangle's center | /r/CapableOf | lie on regular tetrahedron
Facets:
Source sentences:
text: The Reuleaux triangle can also be generalized into three dimensions in multiple ways: the Reuleaux tetrahedron (the intersection of four balls whose centers lie on a regular tetrahedron) does not have constant width, but can be modified by rounding its edges to form the Meissner tetrahedron, which does.