Each side of any one triangle must be congruent to one side of each of the other three triangles.
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No. A right angle would be 90 degrees; a tetrahedron is composed of four equilateral triangles, which by definition have equal angles of 60 degrees apiece.* * * * *Wrong!A tetrahedron is a solid shape enclosed by any four triangles. Only a regular tetrahedron that requires equilateral triangles. So an ordinary tetrahedron can have right angles - up to 3 of them at one vertex.
The fewest number of triangles that make up a trapezoid are two isosceles triangles.
Tetrahedron (4 triangles, like a pyramid design with a triangular base) Cube Octahedron (8 triangles - like two pyramids stuck together at the base, one going up and one going down) Icosahedron (20 triangles) Dodecahedron (12 pentagons)
They can be any kind of triangles.
Put the triangles in a line alternately pointing up and down.