For example, in Y 2 = 2px, the intersection coordinate (p/2,0) directrix x= -p/2 eccentricity e= 1 point P (x0,y0) focal radius formula: PF=X0+p/2. It is enough to master these, and most parabolas are inseparable from their definitions. Just pay attention to the transformation. Parabola should be the most conic curve.