Geometry is so much more than just naming shapes! It includes understanding 3D, reflection, polygons, and more. What better way to explore this curriculum topic than alongside a cute blue monster? Readers meet Mo who is also just starting to learn geometry. In each chapter, Mo learns about a new concept, and each chapter builds upon the knowledge presented earlier in the book. Diagrams and visual aids help readers—and Mo—through pyramids, patterns, and prisms, as they practice what they've learned in problems. A concluding answer key allows readers to check their work.