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Trapezoids at the hoist side is a quite rare feature on flag, existing in the shadow of many triangles. What do you think about it?
(images2.imgbox.com)
In my opinion a triangle generally looks better, but the trapezoid flags definitely gets points for distinctness, which shouldn't be underestimated.
I'm no vexillologist, but I prefer the trapezoid. It means the flag can be constructed entirely out parallelograms. With a triangle though, you need to use an ugly concave pentagon.