A regular rectangle is a quadrilateral with 2 pairs of parallel sides, the pairs of parallel sides are the same length but they are different to the other pair of parallel sides.
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The above definition is not specific enough: it could apply to any parallelogram. It is also a requirement that all its interior angles are right angles.
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Yes. That is part of the definition of a rectangle.
A rectangle, by definition, has 4 right angles.
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Yes, if it has right angles, it is by definition a square, and therefore also a rectangle.
Not possible ! A rectangle is a two-dimentional shape. Volume is a measure of capacity.