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They can vary in size. In its most general form, a trapezoid (or trapezium, outside of North America) is a four-sided figure with exactly one pair of parallel sides. The two parallel sides do not have to be the same length; therefore a trapezoid will have either:

  1. Two acute angles (less than 90º) and two obtuse angles (greater than 90º) OR
  2. Two right angles, one acute angle, and one obtuse angle.

Case (2) is a special type of Case (1).

Regardless of its configuration, the interior angles of a trapezoid always add up to 360 degrees

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9y ago

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