There are no diameters for squares; let us just make that clear.<br>
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Diameter only applies for circles (Line that goes through centre of circle and <br>
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touches edges). However, diameters in squares would be simply length(but went through centre).<br>
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Therefore it could be anywhere between 15-~21.2132.<br>
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(Straight length/width or diagonal or anywhere else.)<br>
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Hope this helps :D<br>
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(I'm Australian-centre, not center)<br>
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There are no diameters for