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A trapezoid has no right angles. A polygon with only right angles is known as a rectangle.

Edit: Depending on what you define as a trapezoid, this shape could in fact have all right angles. A trapezoid has at least one set of parallel lines. Now, there is some dispute among mathematicians about whether or not quadrilaterals with two sets of parallel lines can be classified as trapezoids. If you allow for trapezoids to have two sets of parallel lines, then the quadrilateral could very well be a rectangle as well.

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13y ago

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