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12-96.

Using focus-directrix graph paper, create a parabola that has a horizontal directrix that is four units above the focus. You can get focus-directrix paper on the Lesson 12.1.4 Resource Page available at cpm.org.  Click in the lower right corner of the graph to view it in full-screen mode.

Use this eTool to create a Parabola
Click the link at right for the full version of the eTool: 12-96 HW eTool