[(aa + bb) + (ab+ba)(aa+bb)*(ab+ba)]*[a + (ab+ba)(aa+bb)*b]
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All regular polygons with an even number of sides. Also rectangles.All regular polygons with an even number of sides. Also rectangles.All regular polygons with an even number of sides. Also rectangles.All regular polygons with an even number of sides. Also rectangles.
negative
Yes, as long as ' r ' is a whole number, and not a fraction or decimal.
No. Equilateral triangles will tessellate and a triangle has 3 sides, which is an odd number.
Any regular polygon with an even number of sides must have parallel sides.