they dont have to be they can be different
A rectangle with all sides the same length can also be called a square.
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A "regular" polygon has all sides the same length. A "regular" rectangle has all sides the same length, therefore it is also a square. An "irregular" rectangle then would be any rectangle that is not a square.
No. The sides are not all the same length.
A rectangle with all sides the same length is referred to as a "square". It's not necessary to specify that it has "4 right angles". If it's a "rectangle", then we already know that.
If a rectangle has its length equal to its width, then all four sides are of equal length and it is a square.
A rectangle is a four-sided polygon. It has 4 right angles, and sides opposite each other are the same length. (all four sides can be the same length, in which case it is more commonly known as a square, but it is still a rectangle.