Defination of convex and concave quadrilateral
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If each angle of a quadrilateral is less than 2 right angles,then such quadrilaterals are called as 'convex quadrilaterals' whereas when one of the angles of the quadrilateral is greater than 180 degrees ,it is known as 'concave quadrilaterals'....
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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.
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