recall that "P" is a collection of points on the parabola such that
so in this case since we only know where the Vertex is and Diretrix
we can only give the value of one point of P which is the vertex itself
the distance from the vertex to the directrix is 1/8 and the distance from the vertex to the focus is 1/8
Uh, bigwave, using that definition, "P" is the parabola itself. The wikipedia article Wilmer links to uses "P" mean the distance from the vertex to the focus which, as Wilmer points out, is the same as the distance from the vertex to the diretrix, 1/8. P= 1/8.recall that "P" is a collection of points on the parabola such that
d(FP)= d(DP)