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There are only two proper names for the shape: trapezoid (US) and trapezium (rest of the English speaking world - which is very much larger). Any other names are too broad and would include lots of shapes that are anything but trapezoids. A trapezoid is a polygon but so is any plane shape with 3 or 5 or more straight sides. A quadrilateral is better, but that terms includes (for example) a square which is certainly NOT a trapezoid.

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9y ago

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