a "square"
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A rhombus with 4 congruent angles is a rectangular rhombus having interior angles that are all right angles (90°) and therefore it is a square.
parallelogram or rhombus, not sure
rhombus
A square is a rhombus because it has 4 equal sides. A rhombus is often called a slanted square. However, it is not really a slanted square because a square has 4 right angles. So, all squares are simply rhombuses with 4 right angles. All rhombuses are not, however, squares.
A rhombus