Hermit
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It doesn't exist. I can't explain it yet, but I haven't been able to draw a line through a triangle or a pentagon, so I think it's impossible to do it for any polygon if the number of sides is odd.
Added 27 minutes later
The point is probably that a necessary condition for drawing a straight line through such a polygon that intersects all sides is to have a number of angles greater than 180o equal to the number of sides minus 2 divided by two, which is only possible with an even number of sides.
Added 27 minutes later
The point is probably that a necessary condition for drawing a straight line through such a polygon that intersects all sides is to have a number of angles greater than 180o equal to the number of sides minus 2 divided by two, which is only possible with an even number of sides.
Всё не так плохо как Вы думаете. Всё намного хуже!