1) Let’s draw the segments, observing the given dimension.
The figure shows that the segments AB and CB form a segment AC, the length of which will be equal to the sum of their lengths.
AC = AB + BC = 5 cm 2 mm + 1 cm 8 mm = 7 cm.
2) Check if the solution is correct by attaching a ruler to the figure.
The length of the segment AC is indeed 7 cm.
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