A profusion of diagrams, and lots of practice questions make these six lessons a joy to teach.
I use the topic as an excuse to pack in algebra in a meaningful and purposeful context.
This is the first time I've put this material online (March 2013)
Answers to all exercises are included, but not to the concluding test.
1 Angle Algebra
2 Interior & Exterior Angles
3 Regular Polygon Formulae
4 The Polygon Puzzles
No Answers To The Test