Diameter
Dimension the diameter of the circle, and arc in the parallel projection. You can change the dimension properties before selecting the element to be dimensioned.

- Select Drawing | Dimensions |  Fast Dimensioning > Fast Dimensioning > Diameter. Diameter.
- Select the dimension properties.  Dimension Properties (2D) Dimension Properties (2D)
- Select an arc or a circle.
- Select an auxiliary function from the right-click menu, if necessary:- Select  if you want the dimension on the horizontal reference line if you want the dimension on the horizontal reference line
 - Select  if you want the dimension on the dimension line. if you want the dimension on the dimension line.
  
- Select 
- Click the position of the dimension. Depending on the location of the cursor, the dimension figure is added outside the circle horizontally or vertically. 
- Select Confirm.
Note: 
    
  - You can choose whether to add the Ø character in front of the dimension figure:- Select Drawing | Dimensions |  Fast Dimensioning > Fast Dimensioning > Settings. Settings.
- Select the Misc tab.
- Select or clear Ø sign only when needed.
 
- Select Drawing | Dimensions | 
- You can dimension the diameter of a cylinder face by selecting the Fast Dimensioning function. Select the cylinder face in the projection between the silhouette lines. 
- Dimension a thread by selecting the edge of the hole. The thread length is added as a base dimension. 
