A rhombus
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A rhombus has four equal sides but no right angles.
A shape with 4 right angles and 4 equal sides is a square. ==========================
octogon
You don't tell us enough information. In a square, there are four sides and four angles. The sides are all equal and the angles are all right angles. In a rectangle, there are four sides and four angles The opposite sides are equal and the angles are all right angles. There is no other shape in which all angles are right angles.
A rectangular shape, or a rectangle.