Question

Which step in the construction of copying a line segment ensures that the new line segment has the same length as the original line segment?

Answer 1

old question, answering to close.

steps for copying a line segment:

https://www.mathopenref.com/printcopysegment.html

notice how the compass is opened to the length of the line segment. you can move the whole compass while not altering the length, so the length of the segment is preserved.