There are various nets.
One such is a triangle with three rectangles attached to each side, with a similar triangle attached to one of the rectangles.
Three rectangles attached side-by-side, with one triangle attached to the top of one of the rectangles and another, congruent, triangle attached to the bottom.
you fold into into a triangular prism
Net of the Triangular Prism
A net for a triangular pyramid is made out of 4 triangles. A net for a triangular prism is made out of 3 rectangles and 2 triangles.
Triangular prism: 2 triangles, 3 rectangles Triangular pyramid: 4 triangles.
Google 'triangular prism net' and there will be some guides on there.
trinangleular prism
Net of the Triangular Prism
There are several different nets for a triangular prism. Unfortunately, this browser is not particularly good for graphics.
A net of a triangular-based prism.
=it has three=
A triangular prism
Whatever the net, the answer is the same area as that of the net.