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A quadrangle is any shape which has 4 angles. In order for an angle to exist, there needs to be two lines meeting at a point. If the shape is a polygon (a closed 2d shape) then 4 angles means it must also have 4 sides. Thus a quadrangle with only one side would be impossible.

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โˆ™ 2011-09-25 11:43:15
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Q: What quadrangle has only one side?
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