1
A convex polygon.
A convex polygon.I suspect that what you mean is a convex polygon.
ConvexA convex polygon does not have a "dent" in it.
zero
ConvexA convex polygon.
one
The answer depends on the number of sides in the polygon.
is this a polygon? is it concaver or convex
Any polygon that has an angle that is > 180º is a concave polygon. A convex polygon does not. e.g. All regular polygons are convex.
a polygon is convex
A convex polygon is one with no angle greater than 180 degrees. A non-convex polygon is one that is not without such an angle.
it has four sides