Among topics covered in this book are: Using triangular numbers to find the number of diagonals in an n-sided polygon Transforming non-standard forms of triangular numbers to the standard form A mathematical formula that converts numbers of the Fibonacci sequence to single, unique triangular numbers (invented by the author). What People are Saying About This Book "I do know of books that deal with triangular numbers as a small chapter, unit, or lesson, mostly in a descriptive context, but I am not aware of any that delve into the patterns and relationships as deeply as thoroughly as your book does. I do confess that I have not truly researched the subject either. The mathematics is sound and well-developed, and the objectives listed for each article greatly support the topic of triangular numbers." Penny Jackson, Lawton Public Schools, Secondary Education/Curriculum Specialist