Draw the slab area
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Turn on Snap to Intersection ().
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If previously turned on, turn off Snap to Grid ().
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Double click the Slab Area tool () to edit the default properties.
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In the Default Slab Area Properties dialog box:
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Choose a Concrete Strength of 5000 psi [32 MPa for AS3600; C32/40 for BS8110 & EC2, M40 for IS 456; 30 MPa for CSA A23.3].
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Set Thickness to 12 inches [300 mm].
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Leave Surface Elevation as 0 and Priority as 1.
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Click OK.
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With the Slab Area tool () selected, define the four corners of the slab by snapping at the "outside" corner of each column.
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Complete the rectangle by clicking at your starting point (or type "c" in the command line and press <Return>).