Quadrilaterals are called parallelograms ONLY if both pairs of opposite sides are equal and parallel to each other.
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All squares and rectangles belong to the class of 4 sided quadrilaterals
Yes they are. The definition of a quadrilateral is a closed figure with four sides. A square always has four congruent sides and is a closed figure. Therefore, all squares are quadrilaterals. Trapezoids, rhombuses, and rectangles are also quadrilaterals.
All quadrilaterals are polygons, but not all polygons are quadrilaterals.
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.
Yes, all rectangles are quadrilaterals because they have four sides and all quadrilaterals have four sides.