Plotting 2D parametric curves in GUI - English

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Outline:

* About parametric form of a circle, * About a Slider, * Add a Slider to vary the value of a radius, * Add a Text box for displaying the value of radius, * Add an Axes to display the plot, * Writing Tag and String for all the objects, * Auto-generate Scilab code using GUI Builder Toolbox, * Write a callback function to display the exact value of a radius when the user moves the Slider, * Write a user defined function to plot the circle, * Use of delete command to delete the Axes, * Test the GUI.