diff --git a/src/Nest/Converter/Curves2Parts.ts b/src/Nest/Converter/Curves2Parts.ts
index f3047694e..111d6d130 100644
--- a/src/Nest/Converter/Curves2Parts.ts
+++ b/src/Nest/Converter/Curves2Parts.ts
@@ -20,13 +20,15 @@ export function Circle2Points(circle: Circle, knifRadius: number, splitSize = 10
     let an = Math.PI * 2 / splitSize;
 
     if (outside)
-        radius = radius / Math.cos(an / 2);
+        radius = radius / Math.cos(an / 2) + knifRadius;
+    else
+        radius -= knifRadius;
 
     let cenP = circle.Center;
     let pts: Vector3[] = [];
     for (let i = 0; i < splitSize; i++)
     {
-        pts.push(polar(cenP.clone(), an * i, radius + knifRadius));
+        pts.push(polar(cenP.clone(), an * i, radius));
     }
     return pts as Point[];
 }