diff --git a/src/ant/ant/antObject.cc b/src/ant/ant/antObject.cc
index b17a8cef3..4969bc613 100644
--- a/src/ant/ant/antObject.cc
+++ b/src/ant/ant/antObject.cc
@@ -452,14 +452,6 @@ public:
       out = (trans * p2 (obj)).x ();
     } else if (m_function == 'Q') {
       out = (trans * p2 (obj)).y ();
-    } else if (m_function == 'R') {
-      double r, a1, a2;
-      db::DPoint c;
-      if (obj.compute_interpolating_circle (r, c, a1, a2)) {
-        out = tl::Variant (r);
-      } else {
-        out = tl::Variant ();
-      }
     } else if (m_function == 'G') {
       double r, a1, a2;
       db::DPoint c;
@@ -528,7 +520,6 @@ Object::formatted (const std::string &fmt, const db::DFTrans &t, size_t index) c
   eval.define_function ("P", new AnnotationEvalFunction('P', &eval, index)); // p2.x
   eval.define_function ("Q", new AnnotationEvalFunction('Q', &eval, index)); // p2.y
   eval.define_function ("A", new AnnotationEvalFunction('A', &eval, index)); // area mm2
-  eval.define_function ("R", new AnnotationEvalFunction('R', &eval, index)); // radius (if applicable)
   eval.define_function ("G", new AnnotationEvalFunction('G', &eval, index)); // angle (if applicable)
   return eval.interpolate (fmt);
 }
@@ -840,7 +831,7 @@ Object::compute_interpolating_circle (double &radius, db::DPoint &center, double
 
   db::DVector n = m_points.back () - m_points.front ();
   db::DPoint m = m_points.front () + n * 0.5;
-  n = db::DVector (n.y (), -n.x ()) * (1.0 / d);
+  n = db::DVector (n.y (), -n.x ()) * (0.5 / d);
 
   double nom = 0.0;
   double div = 0.0;
@@ -872,6 +863,7 @@ Object::compute_interpolating_circle (double &radius, db::DPoint &center, double
 
     start_angle = a + da;
     stop_angle = start_angle + 2.0 * (M_PI - da);
+    std::swap (start_angle, stop_angle); // @@@
 
   } else {
 
diff --git a/src/ant/ant/antPlugin.cc b/src/ant/ant/antPlugin.cc
index f95d9ca08..3545deb40 100644
--- a/src/ant/ant/antPlugin.cc
+++ b/src/ant/ant/antPlugin.cc
@@ -80,8 +80,9 @@ static std::vector<ant::Template> make_standard_templates ()
   templates.push_back (ant::Template (tl::to_string (tr ("Angle")), "", "", "$(sprintf('%.5g',G))°", ant::Object::STY_line, ant::Object::OL_angle, true, lay::AC_Global, "_angle"));
   templates.back ().set_mode (ant::Template::RulerThreeClicks);
 
-  templates.push_back (ant::Template (tl::to_string (tr ("Radius")), "", "", "$R", ant::Object::STY_line, ant::Object::OL_radius, true, lay::AC_Global, "_radius"));
+  templates.push_back (ant::Template (tl::to_string (tr ("Radius")), "", "", "R=$D", ant::Object::STY_arrow_end, ant::Object::OL_radius, true, lay::AC_Global, "_radius"));
   templates.back ().set_mode (ant::Template::RulerThreeClicks);
+  templates.back ().set_main_position (ant::Object::POS_center);
 
   templates.push_back (ant::Template (tl::to_string (tr ("Ellipse")), "W=$(abs(X))", "H=$(abs(Y))", "", ant::Object::STY_line, ant::Object::OL_ellipse, true, lay::AC_Global, std::string ()));
 
diff --git a/src/ant/ant/antService.cc b/src/ant/ant/antService.cc
index 362ffe7ea..41be56346 100644
--- a/src/ant/ant/antService.cc
+++ b/src/ant/ant/antService.cc
@@ -709,12 +709,19 @@ draw_ruler_radius (const ant::Object &ruler, const db::DCplxTrans &trans, bool s
     double a = 0.5 * (start_angle + stop_angle);
     db::DPoint rc = center + db::DVector (cos (a), sin (a)) * radius;
 
+#if 0
     //  draw a center marker
     ant::Object center_loc (center, center, 0, std::string (), ruler.fmt_x (), ruler.fmt_y (), ant::Object::STY_cross_start, ant::Object::OL_diag, false, lay::AC_Global);
     draw_ruler_segment (center_loc, 0, trans, sel, bitmap, renderer);
+#endif
 
     //  draw the radius ruler
-    ant::Object radius (center, rc, 0, ruler.fmt (), std::string (), std::string (), ruler.style (), ruler.outline (), false, lay::AC_Global);
+    ant::Object radius = ruler;
+    radius.outline (ant::Object::OL_diag);
+    ant::Object::point_list pts;
+    pts.push_back (center);
+    pts.push_back (rc);
+    radius.set_points (pts);
     draw_ruler_segment (radius, 0, trans, sel, bitmap, renderer);
 
   }