Assertion: parabola | /r/CapableOf | open its vertex
Facets:
value: upward
type: MANNER
Source sentences:
text: The Cartesian equation of a parabola that opens upward and has its vertex (turning point) at the origin is y = 4ax2, where a is the distance from the vertex to the focus, and the quantity 4a is known as the latus rectum.