Are you looking for a font with geometrical symbols or wanting to know where
to find geometrical symbols in the fonts you already have or what? Have you
looked at the Insert | Symbol dialog? Try browsing through the Arial Unicode
MS font (Mathematical Operators character subset).
If you want to create mathematical expressions, use the Equation Editor:
Choose Insert>Object, click the Create New tab, and then select Microsoft
Equation in the list of object types.
I checked the Equation Editor toolbar and didn't find any geometrical
symbols (angles, for example), but these are present at 221F-2226. They are
probably also included in MathType.