It depends on the size of the door. Length times the Width.
it's 6 fit 6 Commercial doors are normally 84" high
The typical door in a classroom is about 2 meters, or two yards and 1/3.
Typical height is 80 inches.
2 inches
The standard width of a classroom door is typically around 32 inches (81 cm), though it can vary depending on the building codes and design specifications. Some doors may be wider, around 36 inches (91 cm), to accommodate accessibility requirements. Always check local regulations for the specific dimensions applicable to your area.
We don't know the floor-size of your classroom, so we can't calculate an answer.
through the door
classroom door knobs
78 inches
Centimetres.
the sentence is incompletely. the subject is missing.
8 feet