Where L1=L2 the point is part of a parabola.
The parabola is the locus of a point that the same distance from a fixed point and a line.
theLocus definition of this graph is that since the locus is the path fallowed and it is in a perabolic shape due to the position of the line and the focus when L1=L2
Li=L2
the locus deinition for a porabola is every point on the porabola will make a have a L1 and l2 of the same lenght l1 is formed from the focus and the l2 is formed from the directrix
all point on the parobola both l1 and l2 are the same.
L1, which is the line between A point and the Focus + L2, which is the line between the same point and the directix = the same length. All the points in which they equal eachother forms a parabola 🙂
The locus definition of a parabola is when Li is equal to L2 when choosing one point on the parabola
a line, made up of points which are equidistant from a fixed point and a fixed line.