SketchUp offers two tools to help you select what entities you want to modify with SketchUp's other tools and commands - the Select tool (), and the Lasso tool (). Here's where you find these tools in SketchUp:

Many models start with basic shapes. In SketchUp, the shape tools help you draw rectangles, circles, and polygons. You find these tools on the Getting Started toolbar, the Drawing toolbar, and the Large Tool Set toolbar.Drawing a rectangle or squareIn SketchUp, you can draw rectangles pretty much anywhere: