n=3.125 what is the value of n?

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I think you answered your own question if n=3.125 then the value of n is 3.125. Either that or more information is needed to help answer the problem.

Also you said that the question has nothing to do with homework, yet you posted this under Education> Homework help > Maths and Sciences. So it was assumed to be a homework question.

seely does not find this helpful : the question had nothing to do with homework!

Time for you to read the rules you agree to. Unhelpful ratings are for factually incorrect information only.

You posted your question under homework help, therefore it's a homework question. If it isn't a homework question, then don't post it in the homework forum.

n=3.125, in this case it is likely referring to the relationship of a circle and square in that the circumference=area and the diameter=side at the number "n". It is referred to as the "Grading system II" for circles relationship between circle & square, diameter & side, diameter, circumference & area. This is a concept for the correct value of "pi" as put forth by Mohammad-Reza Mehdinia.

Hope this helps.