Books by James Tanton

Who said "pi" applies only to circles? What is the value of pi for a square? For a triangle? For other shapes? In this little text we'll learn that playing with values of pi for shapes other than circles has surprising and beautiful good uses. All jolly fun!

A really challenging book that will fascinate anyone interested in puzzles and recreational mathematicians in particular. This volume contains 36 puz-zles ranging from quite easy to quite difficult.