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 In the Sketching toolboxes, select Rectangle. In the Graphics window, create a rough rectangle starting from the origin in the positive XY direction (Make sure that you see a letter P at the origin before you start dragging the rectangle. The letter P at The letter P that shows up when you point the cursor on the origin means that the geometry is constrained at the point is coincident to the origin.)

You should have something like this:

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Now we will specify the appropriate dimensions and constraints. Below is the summary of geometry flat plate boundary layer:

Length: 1 m
Height: 0.5m (another suitable value can be used)

Under Sketching Toolboxes, select Dimensions tab, use the default dimensioning tools. Then click on the lines and drag upwards or sideways as the case may be to place the dimensions

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