We did some this morning at breakfast. Chapter 1 contains a few terms that I omitted originally. I think when we get to the next chapter and do more with angles he'll find it more engaging. He was interested in the new terms: ray, plane, etc.

Last weekend he took two of my 12" rulers and was playing with them making all sorts of angles. Then he got a brilliant idea. I turned around and saw that he had taped them together and wrote on one (it was an old wooden ruler) "0 degrees". smile I haven't had the heart to undo the tape yet.

JB