Young Per and her cousin Radius set out to unlock the secret of Immeter before the sea serpent finds them.

When Matt and Bibi are locked inside an Egyptian pyramid with only each other, their dog Riley, and geometric hieroglyphics, the twins must use their math knowledge to solve the riddles on the walls and locate the burial chamber.

Almost everything in our world is made of shapes. Flat shapes are called plane shapes. Explore real-world examples to learn basic mathematical concets in Shapes, a Let's Do Math! book. --

"This book is designed for a semester-long course in Foundations of Geometry and meant to be rigorous, conservative, elementary and minimalistic.."--Open Textbook Library.