Permutations corresponding rigid motions of a rectangle/rhombus.

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Homework Statement


Find the permutations that correspond to the rigid motions of a rectangle that is not a square. Do the same for the rigid motions of a rhombus that is not a square.


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The Attempt at a Solution


I began by drawing the rectangle and rhombus and labeling sides. I know I need to do something with permutations of the vertices. I feel like I need to do something with angles since they are not right angles, but I can not figure out what to do with angles.
 
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Do I deal with angles at all? I know I need to do something with rotations and flips.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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