No. A quadrilateral is a any closed polygon with four sides. A rectangle is a quadrilateral with four right angles and congruent opposing sides.
Therefore, all rectangles are quadrilaterals, but not all quadrilaterals are rectangles.
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Every square is a rectangle, but not every rectangle is a square.
No.
Nothing, a rectangle is nothing other then itself and that is it!
Yes it has to be just as a square
A rectangle can sometimes be a rhombus, as a square is both a rectangle and a rhombus. However, if all sides are congruent, and it has right angles, it is a square and therefore not a rectangle. So, the answer is no, although it may be argued to be yes. Wikipedia, in fact, mentions that a square is both a rectangle and a rhombus; the definition of rectangle there is a quadrilateral with four right angles, thereby not excluding the special case of a rectangular rhombus, or a square. A rhombus is not normally a square but it could be.