A rectangle, a regular polygon with 4-n sides where n is an integer (eg octagon, dodecagon etc) and also selected irregular versions of polygons with 5 or more sides.
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A rhombus has 4 congruent sides, but it does not necessarily have 4 congruent angles.
RectangleA rectangle has 4 congruent angles, but two pairs of congruent sides instead of all sides being congruent.
A square.
Yes, a square has 4 right angles, which each equal 90 degrees, so they are congruent.
A square.