Assertion: icosahedron's side | /r/HasProperty | mid point of edge
Facets:
Source sentences:
text: 12 sides of length 2, mid point of edge to centre of solid = √2
text: 12 sides of length 2, mid point of edge to centre of solid = 1/ 2
text: 30 sides of length 2 phi, mid point of edge to centre of solid
text: 30 sides of length 2, mid point of edge to centre of solid = (1+Phi)/ 3