Your model is more than just straight lines. SketchUp can help you create curved geometry using arcs. Before you begin drawing arcs, here are a few handy details about the way arc entities work:

Tip: Inserted SketchUp files can now contain Dashed Lines, to learn more about managing those new line types with inserted files, see Working with SketchUp Dashes in Imported ModelsWhether you want to draw the long arc of history or just a precise section of a circle, LayOut has four arc tools that enable you to draw an arc any way you like:

LayOut’s interface contains the basic tools and features you need to create documents and presentations to suit your design needs. Parts of the LayOut interface, and the way you navigate a LayOut document, can look and feel a lot like SketchUp. There are still some key differences to keep in mind.