Find the vertex halfway between the focus and directrix., Draw a series of ordinates, F to 6., Take a radius from the directrix DD to the first Ordinate at F, Move the compass point to the focus and scribe arcs above and below the axis of the ordinate at F., Next take a radius from the directrix to ordinate 1., Move the compass point to the focus and scribe arcs to cut ordinate 1 above and below the axis., Continue as necessary remembering to always draw the arcs having F as the center..

Constructing a Parabola Compass Method

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