Choose the best label

In the following study you will be shown a hand drawn sketch with one stroke highlighed in red. You should select the category that best labels the highlighted stroke. The categories are described below.

To make your choice choose:

A for Arcs
L for Lines
P for Polylines
G for polyGons
E for Ellipses and circles
O for Other. This is for anything that doesn't fit into any other category.
U for Undo if you think you made a mistake

You can use the keyboard shortcuts indicated on the buttons. However, due to bugs in some browsers, for the first stroke you may have to click one of the buttons with the mouse but subsequent strokes should respond to keystrokes.