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
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An ellipse is the proper name for an oval shape, however, a circle is a closed curved shape similar to an oval shape.
Oval kind of a heart shape but its mostly oval
An oval is two-dimensional. An ovoid is a three-dimensional shape based on an oval - like an egg,
long oval shape
The shape of an egg.