Assertion: kite's diagonal | /r/HasProperty | necessary for the solution
Facets:
value: for kite area problems
type: PURPOSE
value: almost always
type: TEMPORAL
value: for other quadrilateral problems
type: TRANSITIVE-OBJECT
Source sentences:
text: For kite area problems (and sometimes other quadrilateral problems), the diagonals are almost always necessary for the solution (because they form right triangles).