A shape net (or a geometric net) is a two-dimensional shape that can be folded up to form a three-dimensional shape or a solid.
An envelope is a good example of a net. An envelope is often used to post a letter. You can open up an envelope to see how it has been made using a single piece of paper.
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If you observe carefully, folding the paper back along the creases and then sticking the flaps with glue will help you get back the envelope (in the 3D form).
Opened up shapes are called nets.
A cubical cardboard box can be opened up to reveal the net it was made from. Many young students are surprised to see that cutting the curved surface of a cardboard reveals a rectangle that was actually rolled up to make the cylinder.
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