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Here is my small paragraph.

The accepted object is further verified by fitting a circle for a selected slice. If the circle fitting error is lower than the defined threshold, it is accepted as a circular object.

Can i use the article 'the' with some nouns even though we are using them for the first time within a sentence?

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    This is two questions. I've edited the second question out. Please feel free to re-ask it as a separate question. – Matt Sep 11 '13 at 7:47
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You can use the definite article in both the cases you are talking of something very specific: the circle fitting error and the defined threshold. You are not talking of a generic error or a generic threshold.

The comma you used in that sentence is fine, and it is normally used in those cases.

If you are happy, clap your hands.

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  • thank for the quick answer. so i think my sentence is error free. is that so? – gnp Sep 11 '13 at 0:31

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