1, first open the word document, as shown in the figure below.

2, and then click the insert option in the menu bar, as shown in the figure below.

3. Click the special symbol option under the insert list, as shown in the figure below.

4. Select the mathematical symbol in the pop-up interface, click the arc symbol, and press OK, as shown in the figure below.

5. After confirmation, you can type the symbol of arc, as shown in the figure below.