To calculate the cross sectional area of a rectangular tube, multiply the widths of two adjacent sides of the tube.
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It depends on the cross section which may be circular, elliptical, square, rectangular or of a more complex shape.
Volume = Cross sectional Area x Height.
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You don't. You can calculate iits radius and cross-sectional area but its diameter has insufficient information to calculate its length
If the bar is circular then it is: pi*radius square