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This book will tell you the most interesting facts about such simple yet important shapes as a square, triangle and circle. It will teach you how to measure angles and calculate area, draw perfectly proportioned shapes without tools and make them into universal construction sets. Children will learn how the oldest cities were planned with the help of a square, and the strongest bridges were built with the help of a triangle, how the Stonehenge stone circles were built and how the height of the Egyptian pyramids was measured. Young readers will also find fascinating masterclasses, tricks with shapes and amazing experiments.