Why would EXCEL have a lesson plan for Geometry?

Nothing to do with excel, but here are some sites which we found useful with
my son.
http://www.easymaths.com/
http://www.bbc.co.uk/scotland/education/bitesize/standard/mathsI/
http://www.bbc.co.uk/scotland/education/bitesize/higher/maths/geometry/index.shtml
try doing a google search too.
Barbara

I'm not sure that these will be a specific match, but you may want to browse
through them for other stuff:

MS shares a bunch of templates (some excel, some word) at:
http://office.microsoft.com/templates/category.aspx?CategoryID=CT062100801033

and you may want to look here, too:
http://www.microsoft.com/education/

There's a link in the bottom left under Educators that looks interesting.