Assertion: triangle's altitude | /r/HasProperty | perpendicular
Facets:
Source sentences:
text: Altitude ( height ) of a triangle is a perpendicular, dropped from any vertex to an opposite side( or to its continuation).
text: altitude of a triangle: the perpendicular segment from a vertex of a triangle to the line containing the opposite side.
text: Thus, the longest altitude is perpendicular to the shortest side of the triangle.