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May 16, 2018 at 6:18 comment added erz @GeraldEdgar sorry, what do you mean? We have more data: the whole parallelogram also is considered a face, and so we know the area. Parallelogram is determined by the area and the lengths of its sides
May 16, 2018 at 6:16 history edited erz CC BY-SA 4.0
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May 15, 2018 at 21:58 comment added Gerald Edgar But, of course, a paralellogram is not determined by the lengths of its sides...
May 15, 2018 at 18:43 history answered erz CC BY-SA 4.0