Geogebra: The Midpoint Formula

I will be teaching Geometry for the first time this year ... hooraaaay!! So, I opened up my Geometry book to one of the first lessons we will be doing and created a Geogebra application which walks through the steps necessary to calculate the midpoint M of a line segment AB. Since I have never used Geogebra actively before, this exercise was very helpful in getting my feet wet with a relatively simple application. I anticipate using Geogebra a LOT this school year :-)