Answer Posted / shikhar

the fuselage of the pressurized aircraft is made circular
because since fuselage is an aerofoil, it has a low pressure
area over the upper surface and high speed, and higher the
pressure at the lower surface. when the fluid flow through
an aerofoil. this creates a variance in temperature and
pressure inside the fuselage. So to minimize this effect
inside the fuselage, it is made of circular cross section.

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