diff --git a/src/shape_arc.scad b/src/shape_arc.scad
index 2bc5bb861..444b2935 100644
--- a/src/shape_arc.scad
+++ b/src/shape_arc.scad
@@ -13,6 +13,7 @@
 **/ 
 
 include <__private__/__frags.scad>;
+include <__private__/__is_vector.scad>;
 include <__private__/__ra_to_xy.scad>;
     
 function _edge_r_begin(orig_r, a, a_step, m) =
@@ -23,7 +24,7 @@ function _edge_r_end(orig_r, a, a_step, n) =
     let(leng = orig_r * cos(a_step / 2))    
     leng / cos((n + 0.5) * a_step - a);
 
-function shape_arc(radius, angles, width, width_mode = "LINE_CROSS") =
+function shape_arc(radius, angle, width, width_mode = "LINE_CROSS") =
     let(
         w_offset = width_mode == "LINE_CROSS" ? [width / 2, -width / 2] : (
             width_mode == "LINE_INWARD" ? [0, -width] : [width, 0]
@@ -31,6 +32,7 @@ function shape_arc(radius, angles, width, width_mode = "LINE_CROSS") =
         frags = __frags(radius),
         a_step = 360 / frags,
         half_a_step = a_step / 2,
+        angles = __is_vector(angle) ? angle : [0, angle],
         m = floor(angles[0] / a_step) + 1,
         n = floor(angles[1] / a_step),
         r_outer = radius + w_offset[0],