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.
(Ortho Mode) and (Object Snap) in the state bar is on.
(2) Choose the pull-down menu 
→
, draw three center lines shown in Figure 1. The length is 100.The two horizontal center line are on the same level.
→, draw three center lines shown in Figure 1. The length is 100.The two horizontal center line are on the same level.
Step 2. Draw circles
(1) Swich layer. In the ‘Layer Manager’ toolbar, choose the ‘Profile Line’ layer .
(2) In the state bar, click the 
button (Show/Hide Lineweight ), the Show/Hide Lineweight mode will be on.
button (Show/Hide Lineweight ), the Show/Hide Lineweight mode will be on.
(3) Draw the first circle.
Choose the pull-down menu 
→
，select the point which is the intersection of two center lines as the center of the circle, input 20 as the radius value and press Enter,the result is shown in Figure 2.
→，select the point which is the intersection of two center lines as the center of the circle, input 20 as the radius value and press Enter,the result is shown in Figure 2.
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