Assertion: tetrahedron's triangle | /r/CapableOf | touch two other triangles
Facets:
value: at a corner
type: LOCATION
Source sentences:
text: Shrink the triangle to 1 / 2 height and 1 / 2 width, make three copies, and position the three shrunken triangles so that each triangle touches the two other triangles at a corner (image 2).