Index: work/alien_formats/easyeda/arc_testbench/arc_sed.c
===================================================================
--- work/alien_formats/easyeda/arc_testbench/arc_sed.c	(revision 39203)
+++ work/alien_formats/easyeda/arc_testbench/arc_sed.c	(revision 39204)
@@ -28,19 +28,20 @@
 static int arc_sed_small(double sx, double sy, double ex, double ey, double deg, double *cx_out, double *cy_out, double *r_out, double *srad, double *erad)
 {
 	double cx, cy, r;
-	double mx, my;
-	double chlen, chvx, chvy, chnx, chny; /* chord */
+	double mx, my, mr;
+	double chlen, chvx, chvy, chnx, chny, chl2; /* chord */
 	double delta = deg * DEG2RAD;
 
 	/* chord middle point, length and normal vector */
 	mx = (sx + ex) / 2.0; my = (sy + ey) / 2.0;
 	chvx = ex - sx; chvy = ey - sy;
-	chlen = sqrt(chvx*chvx + chvy*chvy);
+	chlen = sqrt(chvx*chvx + chvy*chvy); chl2 = chlen/2.0;
 	chvx /= chlen; chvy /= chlen;
 	chnx = -chvy; chny = chvx;
 
 	r = (chlen/2.0) / sin(delta/2.0);
-	cx = mx + chnx * r; cy = my + chny * r;
+	mr = sqrt(r*r - chl2*chl2);
+	cx = mx + chnx * mr; cy = my + chny * mr;
 
 	*cx_out = cx;
 	*cy_out = cy;