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A tetrahedron has four equilateral triangles as sides
true apex :)
Four triangles, similar to the large one, but one third the size.
Four.
No, two equilateral triangles do not make a square. A square has four equal sides and four right angles, while an equilateral triangle has three equal sides but three angles that add up to 180 degrees. When two equilateral triangles are put together, they do not form a shape with four equal sides and four right angles, which is the defining characteristic of a square.