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This book is aligned with the Common Core State Standards for fourth-grade mathematics in geometry: (4.G.3).

Once you start looking, you can find symmetry all around you. Symmetry is when one shape looks the same if you flip, slide, or turn it. It's in words and even letters. It's in both nature and man-made things. In fact, art, design, decoration, and architecture are full of it. This clear and concise book explains different types of symmetry and shows you how to make your own symmetrical masterpieces. Notes and glossary are included.
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全新的角度，給小朋友們深入淺出的講解大自然，世間萬(wàn)物的對(duì)稱(chēng)性的。