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This is a rather vague question, and I'm not exactly sure what you are trying to ask, but if I guessed correctly..... Congruent means that everything is equal in comparison. There are many possible rectangle dimensions, so they all are not congruent. I hope this is what you want to ask.

Q: How do you know that all rectangles are not congruent?

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Yes, into infinitely many sets of congruent rectangles. In fact, all plane shapes - including totally random ones - can be divided into sets of congruent shapes.

yes rectangles are congruent.

Yes.

Because there opposite sides are congruent. And all squares are rectangles, but not all rectangles are squares!

This depends on if the question is asking for each pair of opposite rectangles must be congruent, then it is a rectangular prism.If all of the rectangles are congruent, then it must be a Cube. A square is a special case of a rectangle, and all 6 sides being squares makes a cube and they are all congruent.

Related questions

Rectangles have all angles congruent,

No, only those rectangles that are squares have four congruent sides.

Yes, into infinitely many sets of congruent rectangles. In fact, all plane shapes - including totally random ones - can be divided into sets of congruent shapes.

yes rectangles are congruent.

No, rectangles do not have congruent sides. Squares have congruent sides.

They make two congruent rectangles, not to rectangles! This is because the line joining the midpoints of opposite sides are lines of [reflective] symmetry.

a rectangle has 4 right angles. A rhombus has four congruent sides. A square has four right angles and four congruent sides. All squares are rectangles because all rectangles have 4 right angles, and all squares have four right angles. But not all rectangles are squares because not all rectangles have congruent sides.

Yes.

Yes.

Because there opposite sides are congruent. And all squares are rectangles, but not all rectangles are squares!

This depends on if the question is asking for each pair of opposite rectangles must be congruent, then it is a rectangular prism.If all of the rectangles are congruent, then it must be a Cube. A square is a special case of a rectangle, and all 6 sides being squares makes a cube and they are all congruent.

yes not all of them are congruent i remember in fith grade i learned that