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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.
10/3
cm (centimeter) is a unit of length. I don't recognize dc as a unit of length, so most likely you can't convert it.
Consider the trapezium ABCD in which AD and BC are the top and the bottom - parallel and of known length - and AC and BD are the diagonals - also of known length. Suppose AC and BD intersect at O. Then, it can be shown that triangles AOD and COB are similar. Therefore AO/OC = DO/OB = AD/BC where both lengths for the last ratio are known. Then, given AC, it is possible to calculate OC (and AO) and given BD, it is possible to calculate OB (and DO). So all sides of triangle COB are known and so it is easy to construct it. Then simply extend BO to D (adding OD) and CO to A (adding OA). Join BA, AD and DC. Done!