When a ruler measuring 1 foot (which is equivalent to 12 inches) is bisected, it is divided into two equal segments.
To find the length of each segment, you divide the total length by 2:
\[ \text{Length of each segment} = \frac{12 \text{ inches}}{2} = 6 \text{ inches} \]
Thus, each segment of the bisected ruler is 6 inches long.