Grade 6 · Math · Lesson 23

Nets and 3D Reasoning

A net is a 2D pattern of polygons that folds up into a 3D solid. If you cut a cardboard box along its edges and lay it flat, what you see is a net. In this lesson you will look at nets, count the faces inside each one, and figure out which 3D shape each net builds.

What this lesson teaches

1Define a net as a flat pattern of faces that folds into a 3D solid
2Identify the net of a cube, square pyramid, and triangular prism by counting faces
3Sort 3D solids into prisms, pyramids, cylinders, and cones
4Describe how the faces, edges, and vertices of a solid relate to its net

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