Assertion: triangle's number | /r/HasProperty | half of the number of objects
Facets:
value: clearly
type: DEGREE
value: always
type: TEMPORAL
Source sentences:
text: Clearly, the triangular number itself is always exactly half of the number of objects in such a figure, or: T n = n ( n + 1 ) 2 {\displaystyle T_{n}={\frac {n(n+1)}{2}}} .