There are several: a tetrahedron with 4 equilateral triangles. An 8-sided solid (think of 2 Egyptian pyramids, turn one upside down and put the two square bases together). A 20-sided also has equilateral triangles.
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A square is not a solid figure at all. It's a flat figure, with four congruent faces and four congruent angles.
a square
It is a cube.
It is a cube
A cube has all of those things.