8 feet
about 2 metres
12 feet
The typical door in a classroom is about 2 meters, or two yards and 1/3.
You find a tape measure and take the measurement across the door, then the length of it, then if necessary the thickness.
It is possible to hear a teacher through a closed classroom door if the teacher is speaking loudly or if the door is not soundproof. The ability to hear through a closed door also depends on the thickness and material of the door.
Thickness of door is not measured in km. Kilometer is a big quantity.
The thickness of a standard European door is about 33 inches (919mm).plissescreen.com
through the door
classroom door knobs
the sentence is incompletely. the subject is missing.
8 feet
the smallest average door
classroom door knobs
about 2 metres
about six "feet
12 feet