Step 1.Draw the center line shown in Figure 1.
(1) Swich layer. In the ‘Layer Manager’ toolbar, choose the ‘center line’ layer. Make sure the (Ortho Mode) and (Object Snap) in the state bar is on.
(2) Choose the pull-down menu →, draw two center lines shown in Figure 1.
Step 2. Offset the line.
(1).Choose the pull-down menu →, input the offset distance is 37.5 and press Enter, select the vertical center line as offset object which is shown in Figure 1 and press Enter, click the blank zone on the right and left of the Line respectively to determine the offset direrction. Press Enter to finish.
(2) Repeat the order,and elect the horizontal center line as offset object which is shown in Figure 1.the offset distance is the same with before, click the blank zone above and below the Line respectively to determine the offset direrction. Press Enter to finish. The result is shown in Figure 2.
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