PARABOLA | EQUATION OF NORMAL, PROPERTIES OF NORMAL, CO-NORMAL POINTS | Equation of normal at `(x_1,y_1)` in Parametric form slope form, Equation of normal for all 4 standard parabolas, Normal other than axis of parabola never passes from the focus, Point of intersection of normal at `P(at_1^2, 2at_1)` and `Q(at_2^2, 2at_2)`, Normal at `P(at_1^2,2at_1)` meets the curve again at point `Q(at_2^2, 2at_2)` then `t_2=-t_1-2/t_1`, Locus of Point of intersection of two normal of parabola which are at right angle to one other ., Co-normal Points, The algebraic sum of the ordinates of the feet of 3 normals drawn to the parabola `y^2=4ax` from a given point is 0., Circle through Co normal points, The centroid of the triangle formed by the feet of three normals to the parabola `y^2=4ax`, If three normals drawn to any parabola `y^2=4ax` from a given point `(h,k)` are real then `h>2a`