add radians

docs/lib3x-radians.md

@@ -0,0 +1,15 @@
+# radian
+
+Converts a degree measurement to the corresponding value in radians.
+
+**Since:**: 3.0
+
+## Parameters
+
+- `degrees` : The degrees value.
+
+## Examples
+		
+	use <util/radians.scad>;
+		
+	assert(radians(180) == PI);