The length of the segment AB is 9cm and the segment CD is 2cm shorter, which is the length of the second segment.

If the length of the segment AB is 9 cm, and the segment CD is 2 cm shorter (that is, the length of the second is less than the length of the first segment), therefore, we find the difference: segment CD = segment AB – 2 cm, hence the length of the segment CD = 9 – 2 = 7 (cm).

Answer: the length of the second segment CD = 7 cm.



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