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While every square is a rectangle, not all rectangles are squares. A rectangle can have one pair of parallel lines that are longer then the other pair, however in a square all four sides are the same length.

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To qualify to be a square, the polygon has to have BOTH 4 right angles AND 4 congruent sides. A rectangle does not have both qualifications.

Because a square has 4 equal sides but a rectangle 2 pairs of opposite equal sides of different lengths but they are both 4 sided quadrilaterals

Q: Why is not every rectangle a square?

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A square is a special case of a rectangle. Every square is a rectangle, but not every rectangle is a square. A square is a rectangle with four sides that are all equal in length.

No, but every square is a rectangle.

No. <><><> Sort of like all pears are fruit, but not all fruit is a pear.

No. "The lengths of adjacent sides can be different." True for a rectangle, not true for a square.

Yes, it is. So is every square.

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Every square is a rectangle but not every rectangle is a square.

Every square is a rectangle, but not every rectangle is a square.

Every square is a rectangle.

Yes, every square is a rectangle (a special kind of rectangle), but not every rectangle is a square.

yes every square has a rectangle =]

A square is a special case of a rectangle. Every square is a rectangle, but not every rectangle is a square. A square is a rectangle with four sides that are all equal in length.

No! Every rectangle has a square if that's what you mean

A square is a rectangle with every side being congruent to every other side.

No, but every square is a rectangle.

Every square is a rectangle.

They both have four sides and four right angles. Every square is also a rectangle. But not every rectangle is a square.

No. <><><> Sort of like all pears are fruit, but not all fruit is a pear.