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Because there are two sections to our domain, a heated section and an isothermal section, we will need to split the upper surface of our domain. To split the line, select the Modify tab in the Sketching Toolboxes window, and select Split . Next, click any point along the upper surface of the rectangle. This will split the line into 2 segments.

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Dimensioning

The next step in creating the domain will be adding dimensions. In the Sketching Toolboxes window, select Dimensions > General. First, click the left segment of the upper surface of the rectangle, then click off off of the geometry to place the dimension. Repeat this process for the right segment of the upper surface of the rectangle, then the left surface of the rectangle.

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