If any of the angles is greater than 180 degrees, the quadrilateral is concave.
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A quadrilateral has 2 diagonals. It does not matter whether it is convex or not.
It depends on whether you mean area, perimeter, sides, angles, diagonals, etc.
no
The sum of the interior angles of a quadrilateral is 360 degrees (not 180). The sum of the exterior angles is also 360 degrees. Whether the quadrilateral is convex or concave is not relevant.
It may or may not be.