Adobe Illustrator Circle Tool

How do I activate the circle tool in illustrator? In Photoshop I can just use the right mouse button by clicking on the rectangle tool to get a selection window containing the circle tool. The same doesn’t work in Illustrator, however. Even a double-click on the rectangle tool doesn’t do the trick.

Does anyone know how I should select the circle tool in Illustrator?

Option/Alt Click on the Rectangle Button (default) and you should be able to cycle through all the shapes.

Thank you very much rosem