Question: Drawing circles

Hello all,

 

I was wondering if the following thing is possible and how to do it:

 

I have an assignment, to teach about circles and its equations. What I want to do, is to create some sort of application, that get as input the radius and and the other two parameters of the general equation of a circle, and plots it.

Now, to plot a circle using Maple 17, is fairly easy. But how do I create a graphical bar or other alternative where I can change the values of a,b and r - and the circle changes ?

And one more tricky thing, can I show it somehow in a classroom which do not have maple on it, i.e., can it become an *.exe file or something ?

 

Thanks !

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