How to draw diameter symbol with CAD

1, open CAD, and then draw a graph to be marked.

2. Press the shortcut key D to open the Label Style Manager, and then click Modify on the right.

3. Click "Main Company" in the pop-up window, and enter: %%C (diameter), %%D (angle) and %%P (positive and negative) in the dialog box behind the prefix.

4. Go back and click Set Current.

5. Then return to the main interface and click the tab → Linear.

6. Then select the two endpoints of the part to be marked, so that the perfect diameter symbol can be marked.