Back in my time in the classroom, discussion of the 9-point circle was very awkward, given that construction of even a single example using chalkboard tools was very time consuming and extremely imprecise.
This sketch, made in GeoGebra, is an example of how dynamic geometry opens up a whole new world for students and teachers of mathematics.
The file itself can be found at http://tube.geogebra.org/m/2110147,
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