Answer:
5
Step-by-step explanation:
The ratio of the desired length to the starting length can give you a clue as to the number needed.
Ratio
(3/8)/12 = (3/12)/8 = (1/4)(1/8) = 1/32 = 1/(2^5)
The denominator of 2^5 means you need to cut the 12-inch length in half 5 times. (Each cut multiplies the length by 1/2, so 1/2^5 = (1/2)^5 = 5 cuts.)
You would need to construct 5 bisectors.
