It is a diagonal: nothing else!
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A hexagon with two reflex angles opposite one another will have two diagonals that lie entirely outside the hexagon and one that is partly outside.
The figure is a rectangle.
A plane figure is one that is entirely in one plane. One way to think of that is it can be made to lie flat - no ups or downs. A closed figure is one where you can go around the outside of the figure and return to your starting point - without jumping. If you take any two points - one inside the figure and one outside, then you cannot draw a curve from one to the other without crossing the boundary of the figure.
In most shapes the diagonals do not bisect one another. It might be possible to answer the question if it were more specific. To start with, shapes with how many sides?
you can make 2 trapezoids