which of these statements is true for all trapezoids? a. one pair of sides are parallel b. base angles are congruent c. two opposite sides are parallel d. all the angles are congruent
Definition: A trapezoid is a quadrilateral that has only one pair of parallel sides. The non parallel sides of a trapezoid are called legs. Definition: A parallelogram is a quadrilateral that has both pair of opposite sides parallel. Definition: An isosceles trapezoid is a trapezoid, whose legs have the same length. It is clear from this definition that parallelograms are not isosceles trapezoids.