Part of the Big Ideas

The flat faces of solid (three-dimensional) shapes are two-dimensional shapes.

As they explore three-dimensional solids, children will discover for themselves that the faces (or sides) of these solids look like circles, rectangles, triangles and other common two-dimensional shapes.

© Erikson Institute’s Early Math Collaborative. Reprinted from Big Ideas of Early Mathematics: What Teachers of Young Children Need to Know (2014), Pearson Education.

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