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Fitting a Quadratic Graph on a Picture

This is a task for learning about quadratic graph based on curve fitting. Pictures can be easily imported in a GeoGebra file. A quadratic function can be created and modified in several ways. We can input an equation and manually adjust the coefficients and/or dragging the curve around. Students can see how the equation is updated and make sense of the change in coefficients. Alternatively, we can use the FitPoly[] command after marking a few critical points in the picture. 
open in GGBTube
See how the applet is made and how the graph can be manipulated.
You may download this picture of fountain (on the right) for a try. Otherwise simply search for images of parabolas or other curves on the web and make your own applet of curve fitting.
Picture
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