Just add up all of the sides :)
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A parallelogram cannot be generalised to a convex shape with an odd number of sides.
The product of two odd numbers is always an odd number.
Lots of possibilities: an isosceles triangle, an isosceles trapezium, an irregular polygon with an odd number of sides, where the sides and angles on either side of the base are symmetric.
The odd one out is the cube which is a 3D shape whereas the rest are 2D shapes if that is your question.
Assume it is a rectangular window (why?) Suppose the width is L feet. Then the width is L + 3 feet (Odd, because normally Length is the larger of the two) So Perimeter is 2(Length + Width) ie 38 = 2*(L + L+3) 19 = 2L + 3 16 = 2L L = 8 and then L + 3 = 11 So the window is 8 feet long and 11 feet wide.