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Some rectangles do. We call those rectangles squares. There's not a "why", really, unless you want to get into etymology, in which case this question should be in language categories and not math categories.

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Q: Why does a rectangle not have four equal sides and four right angles?
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Related questions

What shape has 2 pairs of equal sides and 4 right angles?

what shape has 4 right angles and 2 pairs of equal sides?


What is the name of a parallelogram with 4 right angles but not 4 equal sides?

It's a rectangle. A rectangle has four right angles, but only two pairs of equal sides.


Does a rectangle have four equal sides and four right angles?

four equal angles


Does a rectangle have 4 equal sides and it's opposite sides are parallel and has no right angle?

a rectangle does not have four equal sides and its opposite sides are equal and has four right angles


What shape has four right angles parallel sides opposite sides are equal opposite angles are equal and four equal sides?

Rectangle


When is a square not a rectangle?

A square has 4 equal sides, and 4 equal angles and are considered paralellagrams A rectangle has 4 equal angles but not necessarily 4 equal sides, it is also a parallelagram.. On a square all sides are congruent, while in a rectangle only opposite sides are. So when is a square not a rectangle? what defines a rectangle and a square, each shape has to have 4 right angles. the sides are parallel and that in a square all four sides are congruent while in a rectangle only the opposite sides are congruent. So a rectangle must have opposite sides that are parallel and equal and four right angles. A square must have opposite sides parallel, all sides congruent, and four right angles. a rectangle is a parallelogram with four right angles, while a square is a parallelogram with four congruent sides and four right angles. By this definition a rectangle is a square since it has opposite sides that are congruent and parallel and it has four right angles. The question is, why a rectangle is not a square? A rectangle is not a square because it is not required to have four congruent sides.


What has 4 right angles It's opposites sides are equal?

Rectangle.


What is a shape that has two equal sides and four right angles?

A rectangle has two sets of two equal sides and four right angles.


Has 4 right angles its opposite sides are equal?

rectangle


What has 4 right angles and 2pairs of equal sides?

rectangle


What quadrilateral has all right angles equal opposites sides but does not have all equal sides?

a rectangle


Can a rumbi be a rectangle?

Yes. A rhombus has four equal sides. A rectangle has four right angles. If a rhombus were also a rectangle, it would have four equal sides and four right angles. Thus it would be a square.