The geometries you’ve seen so far have been relatively concise, with only a
few points. More complex geometries are conceptually the same but can
easily require hundreds of segments. Defining each line, arc, and curve in a
complex path is extremely verbose and unnecessary—after all, it’s likely
that complex paths will be generated by a design tool rather than written by
hand, so the clarity of the markup isn’t all that important. With this in
mind, the creators of Silverlight added a more concise alternate syntax for
defining geometries that allows you to represent detailed figures with much
smaller amounts of markup. This syntax is often described as the geometry
mini-language (and sometimes the path mini-language due to its
application with the Path element).

To understand the mini-language, you need to realize that it is essentially a
long string holding a series of commands. These commands are read by a
type converter that then creates the corresponding geometry. Each
command is a single letter and is optionally followed by a few bits of
numeric information (such as x and y coordinates) separated by spaces.
Each command is also separated from the previous command with a space.
For example, a bit earlier you created a basic triangle using a closed