Assertion: tetrahedron's center | /r/CapableOf | lie at the spieker center
Facets:
Source sentences:
text: On the other hand, if the mass is distributed along the triangle's perimeter, with uniform linear density, then the center of mass lies at the Spieker center (the incenter of the medial triangle), which does not (in general) coincide with the geometric centroid of the full triangle.