Are all trapezoids scalene

No, not all trapezoids are scalene. A trapezoid is defined as a quadrilateral with at least one pair of parallel sides, and it can have varying side lengths and angles. Some trapezoids can have two sides of equal length, making them isosceles trapezoids, while others can have all sides of different lengths, classifying them as scalene. Thus, trapezoids can be either scalene or isosceles.