JUST FOLLOW THE PATH
In this article, we use the Rectangle tool (A), the Line tool (B), the Push/Pull tool (C), the Two-Point arc (D), the Select tool (E) and the Follow Me tool (F). You now know how to select a path and let SketchUp create a solid object automatically. However, in the images above (1) I’ve created the curved duct manually by extruding a circle.
Draw a path, starting from the centre of the circle. Select the Follow Me tool, click the circle and follow the path you’ve drawn with your mouse. The path will light up in red as you follow it. Click at the end of the path to complete the duct (2).