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Concave is a property of [irregular] polygons. A parallelogram cannot be concave.
A parallelogram cannot be generalised to a convex shape with an odd number of sides.
No, a parallelogram has no right angles.Additional answerIt might do. It could be a square or a rectangle. These are both forms of parallelogram. But it cannot have just one right angle. It either has four or none.
is always 0. A parallelogram is a 2-dimensional object, with length and width but no height. It has an area but, because it is not 3 dimensional, it cannot have a volume.
Not Necessarily some irregular can some cannot