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FOCUS AND DIRECTRIX OF A PARABOLA
How does the distance between the focus (the point) and thedirectrix (the line) affect the shape of the parabola?
The RED Point F is the focus of the parabola. Move it up and down to see how the distance between the focus and directrix affects the shape of the parabola.
![](https://media.screensteps.com/image_assets/assets/002/439/443/original/729e53a7-06f8-46ef-8b0f-4aa9c4cc4bd4.png)