Assertion: octahedron's triangle | /r/HasProperty | congruent
Facets:
value: by ht
type: OTHER
value: by side-side-side
type: MANNER
value: by the height
type: OTHER
Source sentences:
text: Both triangles are congruent by side-side-side, and the height, ht, of each is XF = XG.
text: We have previously shown that the triangles OEN and OGN are isosceles and congruent (the vertices may have different names, but the triangles are the same!)