Assertion: triangle's vertex | /r/HasProperty | ideal points
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: The triangle where two vertices are ideal points and the remaining angle is right, one of the first hyperbolic triangles (1818) described by Ferdinand Karl Schweikart.
text: A triangle where one vertex is an ideal point, one angle is right: the third angle is the angle of parallelism for the length of the side between the right and the third angle.
text: The vertices are sometimes called ideal vertices.
text: The triangle where all vertices are ideal points, an ideal triangle is the largest possible triangle in hyperbolic geometry because of the zero sum of the angles.