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pattern
Construct/make a tetrahedron, which is three-dimensional.
it is a sculpture
Modeling
A net is a two-dimensional figure which can be folded into a three-dimensional figure. It's a little difficult to describe in words . . . To make a regular triangular prism, start with a rectangle, and divide it into three equal (narrow) rectangular strips. on the two ends of one of these strips, make equilateral triangles.