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It must be 0.

Every rectangle can be flexed into a different parallelogram by altering one of its angles to an angle in the range (0, 90). Therefore there are infinitely many parallelograms corresponding to each rectangle. That is, the ratio for each rectangle is 1 : infinity, which is 0.

Therefore that the answer for all rectangles and parallelograms is also 1 : infinity = 0.

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Q: What is the ratio of rectangles to parallelograms?
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