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Why cant a quadrilateral have exactly 3 right angles?

April 26, 2017quadrilateral right

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Why cant a quadrilateral have exactly 3 right angles?

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A quadrilateral can only have either 2 right angles or four. As you may (or may not) know, the angles in a quadrilateral must add up to 360 degrees. If you have 3 right angles that adds up to 270 degrees, so the last side must also be 90 degrees.