diff --git a/PepLib.Core.Tests/IO/DrawingDxfExporterTests.cs b/PepLib.Core.Tests/IO/DrawingDxfExporterTests.cs
index 35509a8..bb6492c 100644
--- a/PepLib.Core.Tests/IO/DrawingDxfExporterTests.cs
+++ b/PepLib.Core.Tests/IO/DrawingDxfExporterTests.cs
@@ -59,5 +59,9 @@ public class DrawingDxfExporterTests
         var arcs = doc.Entities.OfType<ACadSharp.Entities.Arc>().ToList();
         Assert.Single(lines);
         Assert.Single(arcs);
+        var arc = doc.Entities.OfType<ACadSharp.Entities.Arc>().Single();
+        // Angles must be in degrees (0..360), not radians (0..6.28)
+        Assert.InRange(arc.StartAngle, 0, 360);
+        Assert.InRange(arc.EndAngle, 0, 360);
     }
 }
diff --git a/PepLib.Core/IO/DrawingDxfExporter.cs b/PepLib.Core/IO/DrawingDxfExporter.cs
index 4eeb0f4..917bc8b 100644
--- a/PepLib.Core/IO/DrawingDxfExporter.cs
+++ b/PepLib.Core/IO/DrawingDxfExporter.cs
@@ -1,4 +1,4 @@
-using ACadSharp;
+using ACadSharp;
 using ACadSharp.IO;
 using ACadSharp.Tables;
 using CSMath;
@@ -77,8 +77,8 @@ public static class DrawingDxfExporter
                             {
                                 Center = ToXYZ(arcCenter),
                                 Radius = radius,
-                                StartAngle = startAngle,
-                                EndAngle = endAngle,
+                                StartAngle = startAngle * (180.0 / Math.PI),
+                                EndAngle = endAngle * (180.0 / Math.PI),
                                 Layer = layer
                             });
                         }
@@ -104,3 +104,4 @@ public static class DrawingDxfExporter
 
     private static XYZ ToXYZ(Vector v) => new XYZ(v.X, v.Y, 0);
 }
+