Lesson 2 of 11
A flat plan that folds up
Show on a big screenA cube-shaped box, opened flat, is six squares joined in one piece. Fold the piece back and the box is whole again. The face the box stands on is its base.
Step 1 of 3
- A flat net: six squares.
- Fold up the four squares touching the base.
- Fold the last square over the top to close it.
Rule: A net is a flat plan that folds into a solid. One flat piece per face. No piece covers another.
On a cube net, every square joins another edge to edge. A cube has 11 different nets. A turned or flipped net is not a new one.
Cuboids, prisms and pyramids have nets too. A tetrahedron has 4 triangle faces. Only 2 ways of joining the triangles fold up. One is a strip of four triangles. The other is one triangle with a triangle on each side.
Slide Fold. Watch the flat plan become a box.
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Try the lab to finish this lesson.