Yes, all rectangles are quadrilaterals because they have four sides and all quadrilaterals have four sides.
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Yes all rectangles are quadrilaterals.
All squares and rectangles belong to the class of 4 sided quadrilaterals
Squares, parallelograms, rhombuses, and trapezoids are quadrilaterals that are not rectangles.
Not necessarily. All parallelograms are quadrilaterals but not all quadrilaterals are parallelograms. Parallelograms are more specific instances of quadrilaterals. Its like saying all squares are rectangles but not all rectangles are squares.
Rectangles. (Which includes squares.)