1. Click on the "Measure" Tool:
- Once you open your PDF drawing in PDF Blueprint, click the"Measure" button from the toolbar.
- Select the "Arc" Function:
- Find and select the"Arc" option in the measurement tools menu. This allows you to measure an arc in the drawing.
2. Specify the Points:
- To define the arc, simply left-click at three points in the drawing:
- The first point will define the start of the arc.
- Specify the second point on the arc
- The third point completes the arc.
3. Position the Comment Arc:
- After selecting the three points, left-click to choose the position where you’d like the arc comment to appear on the drawing.
![](//inter-f.kuaicad.com/ask/user_uploaded/article_imgs/6688822565857792068/20250109150618035-876.png)
![](//inter-f.kuaicad.com/ask/user_uploaded/article_imgs/6688822565857792068/20250109150633536-731.png)
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