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