No. Most Trapezoids are not isosceles. The non parallel sides must be congruent to be isosceles.
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There are isosceles trapezoids which are sometimes called regular trapezoids.
Isosceles trapezoids, squares, and rectangles.
By definition, a trapezoid only must have exactly one pair of parallel sides. An isosceles trapezoid does have one pair of congruent sides, but not all trapezoids will have exactly one pair of congruent sides.
No trapezoids are parallelograms, and no parallelograms are trapezoids.
NO rectangles are trapezoids