Cindy Neuschwander writes math books for children. Wayne Geehan illustrates these charming, educational stories about Sir Cumference, Lady Di of Ameter and Radius their son who together solve math and geometry puzzles and medieval mysteries. Children learn geometry, measurement, counting, algebra, Pi, formulas and mathematical concepts in clever stories told like medieval fairy tales. Here are free printable geometry lessons from the Sir Cumference stories. Math and Geometry Lessons from 'Sir Cumference' Books by Cindy Neuschwander