Happy Pi Day to You! All About Measuring Circles

Ages 5 to 8, Grades K to 3

Join the Cat in the Hat as he explains how to measure circles and calculate pi in this perfect choice for Pi Day celebrations and nurturing a love of math and numbers!

The Cat in the Hat makes calculating pi—one of the most fascinating numbers in mathematics—as easy as pie! Using a piece of string and two sticks, the Cat first shows beginning readers how to draw a perfect circle. Then, using a can and a piece of ribbon, he shows how to measure a circle’s circumference and diameter, and to use those measurements to calculate pi. Also included is information about the history of measurement and famous Pi Pioneers!

Written in simple rhyme, Happy Pi Day is a natural choice for celebrating Pi Day (held annually on March 14), and for nurturing a child’s interest in math. Fans of the hit PBS show The Cat in the Hat Knows a Lot About That! will be delighted at this new addition to the Learning Library series.

Series Overview: The Cat in the Hat’s Learning Library is a series of collectible nonfiction reference books for beginnning readers. It is an offshoot of the renowned Beginner Book series founded in 1957 by Dr. Seuss. The books feature the characters from The Cat in the Hat and introduce basic science concepts. The PBS Kids preschool science show The Cat in the Hat Knows a Lot About That! is based on The Cat in the Hat’s Learning Library.

About the Author

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.

Author Residence: New Paltz, NY

Author Hometown: Seacliff, NY

Among the many books illustrated by ARISTIDES RUIZ are all the Cat in the Hat Learning Library Books. To learn more about him and his work, visit aristidesruiz.com. JOE MATHIEU has illustrated countless children's books. Find out more about him at joemathieu.com.

Illustrator Residence: Newark, NJ, and Brooklyn, NY