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The problems you missed are listed below with answers and explanations.  Look over the explanation for each problem so you can understand why you missed it!

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A quadrilateral has 4 sides, which connect to form 4 angles.

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In a perfect quadrilateral which 90 degree angles, you have 4 angles which add up to equal 360 degrees. The angles in a quadrilateral will always add up to 360.

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Two intersecting sides are "adjacent" or right next to each other.

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A polygon has angles that add up to a specific number depending on the number of sides. (n-2)180 where n is equal to the number of sides.

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A quadrilateral can not have any angles greater than or equal to 180 degrees, otherwise you would invert one of the angles.

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A quadrilateral is defined as polygon with 4 sides.

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Opposite side of a quadrilateral do not have to be parallel, if they are the shape is still a quadrilateral, but it is also a parallelagram.

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A polygon with 6 sides is called a hexagon.

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Adding all the angles measures of a quadrilateral equals 360 not 180.

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A polygon with three sides is a triangle, the angle measures in a triangle add up to 180 not 360.

'; rightans[0] = 1; rightans[1] = 1; rightans[2] = 1; rightans[3] = 1; rightans[4] = 1; rightans[5] = 1; rightans[6] = 1; rightans[7] = 1; rightans[8] = 1; rightans[9] = 1; //-->