Assertion: triangle's boundary | /r/HasProperty | constant width curve
Facets:
Source sentences:
text: The boundary of a Reuleaux triangle is a constant width curve based on an equilateral triangle.
text: The Reuleaux triangle is the first of a sequence of Reuleaux polygons, whose boundaries are curves of constant width formed from regular polygons with an odd number of sides.
text: Its boundary is a curve of constant width, the simplest and best known such curve other than the circle itself.