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 In the Sketching toolboxes, select Rectangle. In the Graphics window, create a rough Rectangle from 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 origin means the geometry is constrained at the origin.)

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

Length: 1 m
Height: 0.5m

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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