A convex heptagon is one in which all the angles are smaller than 2*pi radians (180 degrees). An equivalent requirement is that a line joining any two points on or inside the heptagon cannot have any point that is outside the heptagon.
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900 degrees. And it does not have to be convex.
Not necessarily. A convex heptagon is a polygon but it need not have all sides and angles congruent.
If it were a perfect heptagon then it would be convex. If it had any indentations then it would be concave.
I think it is niether * * * * * A heptagon is simply a plane shape bounded by seven straight sides. Any polygon with three of more sides can be concave or convex.
A regular heptagon is a polygon with seven equilateral sides. The shape must also be equiangular and convex.