Bored and dissatisfied with his life, a triangle visits a local shapeshifter to add another angle to his shape. Poof! He becomes a quadrilateral. But then he gets greedy and keeps adding angles until he's completely transformed. Kids will enjoy this boldly colorful introduction to shapes and basic math concepts. Now available in Scholastic Bookshelf editions, the Brainy Day Books have been developed by nationally acclaimed math educator and best-selling author Marilyn Burns. Using entertaining fictional stories, these books dispel the myth that math is dry, inaccessible, and unimaginative. At the end of each book, there's a special section that further outlines math concepts and provides questions to further engage children. Kids will get their early math skills in shape with this bestselling picture book--now available in Scholastic Bookshelf! Bored and dissatisfied with his life, a triangle visits a local shapeshifter to add another angle to his shape. Poof! He becomes a quadrilateral. But then he gets greedy and keeps adding angles until he's completely transformed. Kids will enjoy this boldly colorful introduction to shapes and basic math concepts.