Assertion: triangle's length | /r/HasProperty | perpendicular
Facets:
Source sentences:
text: The most commonly encountered formula for a triangle's area is the geometric one: half the product of the length of a side (b in the drawing) and the length of a line (called the altitude, labeled h in the drawing) perpendicular to that side and drawn from the opposite vertex.
text: The area of the triangle is 1.5 times the length of any side times the perpendicular distance from the side to the centroid.