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cant do that here, but construction number one at this link will help you figure it out. http://whistleralley.com/construction/reference.htm
If you mean after the construction is finished, then they prove it was constructed and not measured.
You may have neglected to copy something else that goes with the question, as there are no "above lines".
web can use it for making building construction machine.
Draw a construction line (to be deleted) perpendicular to the lines you wish to draw. Lay one edge of the set-square (not the hypotenuse) along this line and draw one line using the other non-hypotenuse edge. Repeat this further up the construction line. Delete the construction line.