How do you measure a toilet for replacement?

I am replaceing a toilet and when I look up replacement toilets they give you measuments like 27-1/2" x 19" x 29-3/4" and the bowl measures 27-3/4 from finished wall. Can sombody tell me where these measurements are located on the toilet?

Answers:
This link is an example of a rough in sheet, each model of toilet will have one.
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