Trapezoids are not considered parallelograms because parallelograms have 2 pairs of parallel sides, whereas trapezoids have only one.
Some definitions of trapezoid say "at least one pair of parallel sides" in which case, some trapezoids would be parallelograms (the ones that have 2 pairs of parallel sides), but most textbooks in the US now define trapezoids as "exactly one pair of parallel sides."
they are not congruent
No because trapezoids have different properties to that of parallelograms but they are both 4 sided quadrilaterals.
No but they are both 4 sided quadrilaterals.
Yes.
Trapezoids have only one pair of parallel sides. A parallelogram has two pair of parallel sides.
No.
No. Isosceles trapezoids don't have 2 sets of equal sides, which is what a parallelogram is.
trapezoids are never parallelograms.
they are not congruent
No because trapezoids have different properties to that of parallelograms but they are both 4 sided quadrilaterals.
There are absolutely no trapezoids that are also parallelograms.
No. (To the extent that I can make any sense out of the question.)
Trapezoids
No but they are both 4 sided quadrilaterals.
Some people define trapezoids as having at least one pair of parallel sides. By this definition, all parallelograms are trapezoids, though not all trapezoids are parallelograms.Some people define trapezoids as having exactly one pair of parallel sides. By this definition, the terms "trapezoid" and "parallelogram" are mutually exclusive.
Yes.
Quadrangles that are not parallelograms = trapezoids, kites, any other polygon that is not a parallelogram