A quadrilateral.
It may be a rectangle, parallelogram, trapezoid, or an irregular quadrilateral.
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A shape with 4 equal sides is a rhombus. If it also has 4 equal angles, then it is a square.
A square has 4 equal sides with opposite angles that are equal.
rhombus
triangular pyramid-4 equal faces
No because it is flat 2d shape with 4 equal sides