“Sir Cumference and The Dragon of Pi” is a math picture book written by Cindy Neuschwander and illustrated by Wayne Geehan. The story starts with the father of Radius having a stomach ache. Radius goes to the doctor to see if he had anything to cure his father’s stomach ache. The doctor wasn’t there but he found a potion that he thought would cure his father. Radius gave it to his father but his father turned into a dragon! The castle guards in the castle had seen the smoke from his father breathing fire. The guards said they needed to “vanquish the beast”. Radius went to his mother and told her that his father had turned into a dragon and that he was going to be slain tonight. Radius went to go see if the doctor had any potions that could cure his father. Radius found a potion with a poem on it that he thinks can cure his father. Radius went to the workshop to visit the Geo of Metry to try and find the magic number to help his father. Geo of Metry gave Radius a hint to what he needed to do and Radius rushed out. Next radius went to visit Lady Fingers and she asked the Radius to help her finish the last pie. Radius got another hint to what he needed to do and ran out again. Radius knew the magic number was greater than 3 but didn’t know exactly. Radius used Geo of Metry’s measuring tape and found out that the circumference of a circle was always 3 1/7 times the length across. Radius was running back to the doctor’s office and saw his mother coming towards him. His mother told him that she could not find the doctor anywhere. Radius said that he knew the magic number and then radius went to the doctor’s workroom to get the cure. Radius fell asleep with the cure and when he woke up he thought to himself he needed to rush. Radius measured his father in the shape of a circle and found out his diameter and then his circumference. The knights had arrived and they ran. They cured his father and Cir Cumference went back and everything was normal again. I don’t think there is a theme to the story, someone just made a book using a bunch of math terms and made it fun for kids. I think that this book is directed to kids just starting to learn about circles and all about their circumferences, diameters and radii (plural for radius). I would rate this book 2 out of 5. I didn’t really enjoy the book just I think other people might have, I just don’t find many parts of the book interesting.