what is meant by convex and concave quadrilaterals
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Convex and Concave Quadrilaterals. 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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A convex quadrilateral has both diagonals completely contained within the figure, while a concave one has at least one diagonal that lies partly or entirely outside of the figure. Those are good definitions, but the concave shapes having a cavity or cave is probably an easier way to remember it.
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