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If and when two parallelograms are similar, you know that the ratio of two side lengths within one parallelogram will describe the relationship between the corresponding side lengths in a similar parallelogram. If and when two parallelograms are similar, you know that the ratio of corresponding side lengths in the other parallelogram will give you the scale factor that relates each side length in one parallelogram to the corresponding side length in a similar parallelogram.
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A parallelogram has a rotational symmetry of 2!
Many crystals have faces which are parallelogram and they existed long before there were any human beings. So parallelograms were not invented by people.
Perimeter = 40+40+60+60 = 200 units