If, for any two points A and B in the polygon, all points with position A + kB are inside the polygon for 0 ≤ k ≤ 1, then the polygon is convex. In simple terms, if all points on the line AB lie inside the polygon, it is convex. If there is at least one point on AB that is outside the polygon then it is not a convex polygon.
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A polygon (or any other plane shape) is convex if you take any two points inside it (or on its boundary) then the line joining those points is wholly inside (or on the boundary of) the polygon.
If any of the angles is greater than 180 degrees, the quadrilateral is concave.
I can not tell you. It is because i do not know what shape the polygon is. You must tell me that first.
A regular polygon will tile it if its internal angle divides 360 degrees.
tell me