diff --git a/fillets/primitives.scad b/fillets/primitives.scad
index c9b7f1b..0f93c91 100644
--- a/fillets/primitives.scad
+++ b/fillets/primitives.scad
@@ -1,3 +1,10 @@
+test_fillet_primitives ();
+
+module test_fillet_primitives ($fa=5, $fs=0.1)
+{
+	 mcad_fillet_primitive(60, 5);
+}
+
 /**
  * mcad_fillet_primitive(float angle, float radius)
  *
@@ -11,7 +18,7 @@ module mcad_fillet_primitive (angle, radius)
 {
 	half_angle = 0.5 * angle;
 	chord_corner_dist = radius * cos(half_angle) / tan(half_angle);
-	chord_centre_dist = radius * sin(half_anglew);
+	chord_centre_dist = radius * sin(half_angle);
 
 	corner_centre_dist = chord_centre_dist + chord_corner_dist;