The arched wall defined by three points is used to draw arched walls when there are three existing points you'd like to reference

To draw this type of arched wall such as the example below, follow these steps:

1. Draw three straight walls and one help line extending from the middle of the bottom wall.
2. Select the arched wall through three points tool from the component tab and let it find the end of one wall. Click it in place when the word End appears.
3. Go to the end of the help line and click.
4. Lastly, move the cursor to the end of the other existing wall and click.
5. Once you are finished, press Esc on your keyboard, or move your cursor outside of the drawing area to escape the command.