distunguish betweenbconvex and concave quadrilaterals
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A convex quadrilateral has interior angles 180 degrees or less. A concave quadrilateral has an interior angle measure greater than 180 degrees. Most common quadrilaterals are convex, and they do not have any interior angle measure greater than 180 degrees.
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Convex -- Each interior angle is less than 180° and the two diagonals are inside the closed space of the quadrilateral.
Concave -- One interior angle is greater than 180° and one diagonal lies outside the shape. Simple -- The quadrilateral does not cross its sides (it is not self-intersecting)
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