Explain the differences between two-dimensional (flat) shapes and three-dimensional (solid) shapes. How are the book and piece of construction paper the same?

解释二维(平面)图形和三维(立体)图形的不同：书和美术纸有什么相同之处？

youdao

Explain the differences between two-dimensional (flat) shapes and three-dimensional (solid) shapes. How are the book and piece of construction paper the same?

解释二维(平面)图形和三维(立体)图形的不同：书和美术纸有什么相同之处？

youdao