Follow the steps below to copy segment AB:
1. Use the line tool to construct line m below segment AB
2. Use the point tool to construct point E on line m. Right click on the point to show its label.
3. Use the Compass tool to measure the length of segment AB, then click on Point E to center the Compass tool at that point.
4. Construct Point F at an intersection of line m and the circle you just constructed.
5. Hide everything in your sketch (right-click, Show Object) except for Points A, B, E and F and segment AB.
6. Use the Segment tool to construct segment EF.
7. Drag things around in your sketch and observe what happens.

Follow the steps below to copy segment AB:
1. Use the line tool to construct line m below segment AB
2. Use the point tool to construct point E on line m. Right click on the point to show its label.
3. Use the Compass tool to measure the length of segment AB, then click on Point E to center the Compass tool at that point.
4. Construct Point F at an intersection of line m and the circle you just constructed.
5. Hide everything in your sketch (right-click, Show Object) except for Points A, B, E and F and segment AB.
6. Use the Segment tool to construct segment EF.
7. Drag things around in your sketch and observe what happens.