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Some basic shapes like a Sphere, a Torus or an Ellipse are not included in the default tools in SketchUp. They all can be done quite easy without the need of a Plugin, but of course anything that speeds up the modleing process is more than welcome.
Here you can see a quick video showing how to model a Sphere, a Torus and an Ellipse in SketchUp with the standard tools.
As you can see, it is a pretty simple process. Still, some of you might want to have these tools directly accessible on the Draw menu. For this, Regular Polygon has created several Plugins, simply click on the links below to access the Plugin website and to download them.