Detailed description

No equation given, parabola with turning point at (0,0), point marked on parabola in quadrant 1 as P(x,y), focus marked as S(0,a), directrix labelled as y = −a, point marked on directrix in quadrant 4 as T, line connecting point T to point P, and point P to point S, lengths given as PT = PS. Right angle created by line from point T to directrix.