# Locus Definition of a Parabola

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**locus**is a set of a points that all meet a certain condition. In the diagram below, consider the locus containing all points P meeting the conditions of the program. You may slide any of the points in the diagram and the slider in order to answer the questions following the diagram.**1) What is another name for the shape of the locus containing only the points P as shown in the diagram?**

**2) What do you notice about the distances between P and the focus and directrix?**

**3) By moving some of the points the diagram, the locus does not satisfy the definition of a function. How can you limit the diagram to make the locus satisfy the definition of a quadratic function?**

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