Happy Pi Day to You! All about Measuring Circles

＂The Cat in the Hat explains how to measure circles and calculate pi in this perfect choice for Pi Day celebrations＂--

Bonnie Worth is the author of countless books for young readers, among them 18 of the Cat in the Hat’s Learning Library books, including Oh Say Can You Say Di-No-Saur?, If I Ran the Rain Forest, Oh Say Can You Seed? (winner of the 2003 Ohio Farm Bureau Award), Hark! A Shark!, and If I Ran the Horse Show.

Aristides Ruiz is the illustrator of all the Cat in the Hat’s Learning Library books.

Joe Mathieu has illustrated countless books for children, including Big Frank’s Fire Truck, Sesame Street titles, books in the Cat in the Hat’s Learning Library series, and many more.