It is the analytic geometry formula for finding the angle between two planes.
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Because it will provides maximum dflection in Only vertical direction and no any other bending of tube due to pressure occurs.instead if cross section is circular then along with vertical defletion or bending of tube there is also bending along horizaotal direction,which leads to error.so it has oval shape............got it
I don't get this question. Bikes have several angles, seat tube, steerer tube ASO
If there are no angles, all you have is a 'straight side'. There is a plane and no shape. Maybe you are thinking that straight means standing up straight. You might then be thinking of an upright tube.
weight of ms hollow bar 20mm*20mm
Divide its weight by 20736 cubic units of volume.