



 
Jorge, I included the photo you sent of a piece of the gasket. If I understand correctly you want to form the gasket into a circle and you want to know the diameter of the circle as a function length of the gasket, the circumference of the circle. The expression you want is
where π = 3.1416. Thus
Hence for the example you sent with the circumference = 21 inches
If you don't like decimal parts of inches take the decimal part. 0.68 and multiply by 16 to convert it to sixteenths. Thus 0.68 × 16 = 10.88 so the diameter is 6 ^{11}/_{16} inches. I hope this helps,  


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