They are 4 triangles and one square.
What they might make when assembled together depends on their sizes and on the shapes of the triangles.
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a square pyramid has 4 triangles
4 right triangles
The figure is a square pyramid. It is made with a square on the bottom and 4 triangles meeting at a vertex perpindicular to the square. The square has 1 face, the 4 triangles each have one face making 5 faces. The edges are made where the triangles meet each other and where they each meet the square. There are four vertices at the corners of the square and the one at the top of the pyramid.
Triangular. the base is square, with four other triangular faces.
when a square has even numbers like 4 inches on four sides, 2 triangles will have the same number on all three sides.