An infinitesimally small percentage.
Select any three points in the Cartesian plane. There are only 3 other points in the whole plane which will then give you a parallelogram whereas any of the infinite points other than the original 3 and these 3 will give a quadrilateral.
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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.
They are quadrilaterals which have two pairs of parallel sides.
All parallelograms are in the class of 4 sided quadrilaterals.
Squares, parallelograms, rhombuses, and trapezoids are quadrilaterals that are not rectangles.
No kites are not parallelograms but they are both quadrilaterals because they have 4 sides