Equal Length Constraint
Makes the first selected line have the same length as the second line.
- Start with two lines. Activate the Equal Length constraint and select the line whose length you want to change.
- Select the line whose length you want to assign to the first line.
The first line's length changes to match the second. The equal constraint (an equal sign) appears. 
- If you edit either line, the equal length constraint will be maintained.
