Convex Quadrilateral

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 figure, ABCD is a convex quadrilateral because AB, BC, CD, DA, AC, BD are in the same region of the quadrilateral.

Convex-Quadrilateral

In a convex quadrilateral each angle measures less than 180°.

Concave quadrilateral: A quadrilateral is called a concave quadrilateral, if at least one line segment joining the vertices is not a part of the same region of the quadrilateral.

Concave-Quadrilateral
Convex Quadrilateral

convex quadrilateral

concave quadrilateral

what is a convex quadrilateral

concave angle

a concave quadrilateral