Double tetrahedrons come in different sizes and complexities. The current online resources have no user diagrams, but some books may. You may want to consult the related link for suggestions.
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There are many tutorials on the internet that show you how to make origami planes. (Paper airplanes.) You can find them by searching 'Paper Airplanes' on Google.
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Four triangular faces.
Well, a tetrahedron has four sides. A regular tetrahedron is a triangular pyramid.
A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.