What conic section definition and property are dynamically being illustrated in the applet below?
[b]Definition: [br][/b][br]A [b]PARABOLA[/b] is a locus of coplanar points that are equidistant from [b][color=#1e84cc]a given point (focus)[/color][/b] and [b][color=#666666]given line (directrix). [br][/color][/b][br][b]Property:[/b][br][br]The [b]latus rectum [/b]of any parabola is equal to four times the distance from the parabola's vertex to its focus.