The shape that has a net that contains triangles could be a triangular pyramid.
If you draw a triangular pyramid or get the shape of it, you can see that there are 4 triangles in the shape.
I hope this answer helped you. If not, then i hope you find it.
I really didn't get the question but i think my answer could help.
You can search it up on Google "Triangular Pyramid" and see the shape and also get an image of what i meant.
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