Step 1th, open the Word2010 document window, click the formula you want to add the geometry symbol to, and position the insertion cursor in the target location, as shown in Figure 1.
Figure 1 Click the formula you want to add the geometry symbol to
Step 2nd, click the other button in the symbol group in the formula Tools/design ribbon to open the symbol panel, and then click the Drop-down triangle button at the top. Select the geometry option from the Open Drop-down menu and select the geometry symbol you want in the open Geometry symbol panel, as shown in Figure 2.
Figure 2 Choosing to add geometry symbols