To find the length of \( DC \) in the given parallelogram ABCD, we can use the fact that in a parallelogram, opposite sides are equal in length.
Given:
- \( AD = 13 \)
- \( DB = 24 \)
Since \( AD \) is equal to \( BC \) and \( AB \) is equal to \( DC \), we can conclude:
- \( DC = AB \)
- \( AB = DB = 24 \)
Thus, \( DC = 24 \).
So the length of \( DC \) is 24.