The complementary strand of a DNA segment is determined by matching each base with its complementary base. The complementary bases in DNA are:
A-T (Adenine pairs with Thymine)
C-G (Cytosine pairs with Guanine)
So, the complementary base sequence of the DNA segment TCGATC would be:
A-T-C-G-A-T
So the complementary strand would be AGCTAG