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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 really like Kuwait's flag. It's bold, and it looks a bit 3D.
I don't think it looks great when some other device is superimposed on the trapezoid like in the other two examples you give. I generally don't like things superimposed on triangles either, though.
Plus the other two look a bit off-center