me assume yu meen REGULAR hexagon...6 sides & all sides & angels the same
symmetrik bout vertikal & horizontal axis thru senter
& also thru lines from senter thru senter av all sides...impli 6 waes,
but the y-axis duplikate 1 av em, so it add 5 lines
& then lines thru the korners ("vertexes" in krat speek)
yu hav 6 av em, but half is other half so its reelee 3, but then 1 =x-axis
it add up tu 6 yuneek lines...3 tu side middel, 3 tu korners.
total=4 lines av symatree