This assignment was challenging. Making the custom tool and having the aniamtion work was hard enough but tring to figure a way to get this into lesson plans will take a lot more mork. I know that the kids at my school would rather work with software and explore geometry than have lectures and homework. Being able to demonstrate and discuss conic outside of algebra will be a nice change for my students.
Here is a sketch of two cicles tanget to a third circle.
To see an animation of this sketch click here.