Assertion: tetrahedron's face | /r/MadeOf | $v$
Facets:
Source sentences:
text: In that case, the limit of the angle subtended by an edge $e$ not incident at $v$ is the vertex angle at $v$ of the face containing $e$ and $v$, and the limit of the angle subtended by an edge $e$ incident at $v$ is $\pi-\angle(d,