With the Radius dimension tool, you can measure the radius of circular shapes and objects in the 2D view or your drawing. In the example below, we’ll measure a circular column.

To use this tool, follow these steps:

1. Select the Radius dimension tool on the Tools component tab:
   
2. Move the mouse cursor to the 2D view of the drawing area and hover near the outside edge to let it snap to the shape/object that you want to measure. The dimension shows a zero value:
3. Click once. The radius is automatically calculated and the value is updated:
   
   
4. If you want to reposition the text, click the yellow snap point and start moving the mouse pointer along the shape/object. Release the mouse button when you are happy with the placement: