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CCD is not a Roman numeral. C is a Roman numeral which has a value of 100. D is also a Roman numeral which has a value of 500. However according to the rules of writing Roman numerals although a C can preceed a D, to represent 400, no number should be preceed by two or more numbers of lesser value. If CCD was a Roman numeral it would have a value of 300 but the correct Roman numeral for 300 is CCC.
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It is not possible to answer the question because there is insufficient information. Also, there is no way of telling whether the trapezoid has AB parallel to DC (with AD and BC equal) or if AD is parallel to CB (with AB and DC equal). It is not clear what is meant by ccd. What is x? In any case, the length of one side, whichever it is, is not enough to answer the question.
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An internal caliper gauge.