Geometric Elements 
You can add geometric elements to the graphics area. The elements are
associated with a comment.
To add geometric elements to a comment:
Click one of the following geometric element markup tools on the Markup tab 
or the Tools, Markup
menu.
Horizontal and vertical snaps are available
automatically.
To draw an individual line, click and drag.
The Line tool remains enabled.
You can draw multiple lines, either starting from an existing point, or
as new lines.
Rectangle
. Click to place one corner, move the pointer to the opposite
corner, then click again.
Circle 
. Click to place the centerpoint, move the pointer to set
the radius, then click again.
Arc 
. Click to place the arc centerpoint. Move the pointer and
click again to set the radius. Move the pointer to define the arc and
click again.
Spline
. Click to place the first point, move the pointer to
the next point and click, and so on. Press Esc
to release the tool.
You can also use the click-and-drag method
to create rectangles, circles, arcs, and splines.
To release a tool, click another tool, or click Select
.
To edit a geometric element:
To
resize an element, select it and drag a handle 
.
To
move an element, drag it (not the handles).
To
delete an element, select it and press Delete.