Laugh and learn with fun facts about the history of pi, measurements, theorems, and more--all told in Dr. Seuss's beloved rhyming style and starring the Cat in the Hat! "It is all about circles and measuring fun. So put on your Pi Hats! Let's start, everyone!" The Cat in the Hat's Learning Library series combines beloved characters, engaging rhymes, and Seussian illustrations to introduce children to non-fiction topics from the real world! Go on an adventure with the Cat in the Hat and learn: how to measure and draw circles how pi is a number so long that it never ends how Ancient Egyptians used pi to help build the pyramids and much more! Perfect for story time and for the youngest readers, Happy Pi Day to You! All About Measuring Circles also includes an index, glossary, and suggestions for further learning. Look for more books in the Cat in the Hat's Learning Library series! High? Low? Where Did It Go? All About Animal Camouflage Is a Camel a Mammal? All About Mammals The 100 Hats of the Cat in the Hat: A Celebration of the 100th Day of School A Great Day for Pup: All About Wild Babies Would You Rather Be a Pollywog? All About Pond Life I Can Name 50 Trees Today! All About Trees Fine Feathered Friends: All About Birds My, Oh My--A Butterfly! All About Butterflies Oh Say Can You Seed? All About Flowering Plants Inside Your Outside! All About the Human Body Ice is Nice! All About the North and South Poles.