Trapezoid - Math is Fun
https://www.mathsisfun.com/geometry/trapezoid.html
WEBA trapezium (UK: trapezoid) is a quadrilateral with NO parallel sides. The US and UK have their definitions swapped over, like this: Mathopolis: Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10. Quadrilaterals Geometry Index. Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.
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