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To begin sketching, click on the Sketching tab in the Tree Outline window. To draw our domain, we will use the Rectangle tool. Click on in the Sketching Toolboxes window. In the graphics window, draw the rectangle by first clicking on the origin (make sure the P icon is showing, meaning you are in fact selecting the point), then select a point in the 1st quadrant.

Next, we need to create another rectangle, adjacent to the first. To accomplish this, we will use a 3-point triangle. Select the rectangle from 3 points tool Image Removed from the sketching tool bar. Next, select the three points specified below. This will create a second rectangle in the graphics window.

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Now, we need to draw the wedge outline in the geometry. We will use the line tool to create the wedge. Select the line tool in the Sketching Toolboxes window.

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