Mark Large Radius
The Mark Large Radius 
tool flags arc
segments whose radius exceeds a threshold. Very large-radius arcs are almost straight
and are often unintended or problematic for downstream processing; marking them lets
you review and correct them.
Using the tool
-
Enter the Threshold Radius in the input bar.
-
Select the Mark Large Radius tool, then press Enter.
Every arc with a radius larger than the threshold is marked with a spot marker at its midpoint. The default threshold is 2000 units. Full circles are not marked.
This tool only inspects the drawing; it does not change any geometry.