Set up the eccentricity line. This will be a 45° line for a parabola., The vertex is found by projecting up from the focus at 45° to the axis to hit the eccentricity line and down perpendicular to the axis , giving V., Draw a line perpendicular to the axis through the focus giving the focal line., Where the eccentricity line and focal line intersect is a point on the curve which can be swung below the axis., Draw lines 1,2,3,4… up to the eccentricity line, perpendicular to the axis and then project across to the focal line, parallel to the axis. This finds a,b,c,d., With the focus as center, scribe an arc from A to hit line 1 above and below the axis., With the focus as center, scribe an arc from b to hit line 2 above and below the axis., Continue in this manner to plot more points on the curve..

Constructing a Parabola Eccentricity Method

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