weight of ms hollow bar 20mm*20mm
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The answer will depend on what the tube is made from and how thick its walls are.
(Side1Xside2) x ((side1-2t)x(side2-27))*0.007850 where all dimensions are in mm & the weight is Kgs/Mtr
Divide its weight by 20736 cubic units of volume.
It is the analytic geometry formula for finding the angle between two planes.
5*4 = 20 square inches