What is the height of the Boeing 747-8 landing gear? I can never find any information about the height of the landing gear on any airliner(can you put it into feet and inches).And Is the height of the 747-8 landing gear around the same height as the 737 or airbus a320.
In general, the landing gear height is defined as the distance between the ground and the conjunction between main gear strut and the aircraft structure (fuselage, wing, nacelles, etc.).

The landing gear height of any aircraft varies depending the loading conditions and where you measure it (nose or main landing gear). This info is from the 747-8 Airplane Characteristics for Airport Planning document by Boeing.



Image from 747-8 Airplane Characteristics for Airport Planning by Boeing

Here, 'E' gives the height of the (main) landing gear attached to the fuselage.