Assertion: ball | /r/HasProperty | bounded by sphere
Facets:
Source sentences:
text: ball is the volume bounded by a sphere
text: In mathematics, a ball is the volume space bounded by a sphere; it is also called a solid sphere.
text: The ball is a bounded interval when n = 1, is a disk bounded by a circle when n = 2, and is bounded by a sphere when n = 3.