How do you duplicate a shape?

In order to duplicate the shape, select it by clicking it, copy it (Ctrl + C or right-click, Copy) and paste it (Ctrl + V or right-click, Paste).

The second way how to do it is to hold Alt key, press and hold the left mouse button on the shape you want to duplicate and drag the another location. After you release the mouse button, the shape will be duplicated and its copy will be placed to the new location.