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.
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A square, but not a rhombus because a rhombus does not have four congruent angles
A rhombus has 4 congruent angles when its diagonals intersect each other at right angles otherwise it has a pair of opposite equal acute angles and a pair of opposite obtuse angles.
A rhombus.
A Rhombus is:A quadrilateralAll sides equalOpposite sides parallelA Rhombus is a quadrilateral, therefore its interior angles sum to 360°If all the interior angles are congruent they are all 360° ÷ 4 = 90°Thus a Rhombus will 4 congruent angles is:A quadrilateralAll sides equalOpposite sides parallelAll angles equal (to 90°)This is the the definition of a Square. A Square is a "special" Rhombus with all angles equal.
A square or a rhombus. A rhombus does not have 4 congruent angles as a square does. It's always a rhombus. And, depending on the angles, it could also be a square. (This definition treats the square as a special case of the rhombus.)