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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 Added from the sketching tool bar. Next, select the three points specified below

capture-1.mp4
tool from the