Assertion: octahedron's triangle | /r/HasProperty | formed
Facets:
Source sentences:
text: This symmetrical solid is made up of eight triangles, which is formed from placing two square based pyramids base to base.
text: This symmetrical solid is made up of eight triangles, which is formed from placing two square based pyramids base to base.
text: Since the omnitruncated forms have 3 faces/vertex, new triangles are formed.