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You cannot create a cross sectional area of a rectangle. You can only create cross sectional areas for triangular shapes.
To calculate Cross Sectional Area:
Width x Depth
the larger the cross sectional area, the smaller the resistance
Volume = cross sectional area * lengthArea = 2* cross sectional area + perimeter of cross section * length
The cross sectional area of a slab can be found by squaring the height of the slab.