SIMPLE DEFINITION OF CONVEX AND CONCAVE QUADRILATERAL..
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A convex quadrilateral has both diagonals completely contained within the figure.
A concave quadrilateral has at least one diagonal that lies partly or entirely outside of the figure.
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Answer:Convex quadrilateral: A quadrilateral is called a convex quadrilateral, if the line segment joining any two vertices of the quadrilateral is in the same region. In a concave quadrilateral at least one angle is a reflex angle, i.e., an angle larger than 180°. ...
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