What is the terminology for this geometry ratio?

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So if we imagine a rectangle. The aspect ratio is width/height.
What if you want the ratio of the parallel sides? Is there a terminnology for that ratio?
 

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  • #2
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That ratio is always unity. Why would you need a special word for that?
 
  • #3
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Sorry, my example was a bad one. The actual shape I'm interested in is a trapezoid which I think, theoretically, does not have an aspect ratio defined, but for the purposes of my project I have one defined. If you imagine a trapezoid with the parallel sides oriented vertically, is there a ratio for the parallel sides?
 
  • #4
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Unclear: do you want to know whether a special name for this ratio exits, or do you want to find some equation for it?
 
  • #5
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The name.
 
  • #6
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I am not aware of any special for that.
 
  • #7
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Nor am I. The reason there's a name for the ratio of the length to the width of a rectangle is because TV screens, theater screens, and computer monitors are all rectangular, but can have different aspect ratios. There isn't any similar real-world use for trapezoidal image formats, so it's doubtful anyone has come up with a name.
 

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