The meter.
The appropriate unit is a metre.
Meters
12*sqrt(2) ----
Metres
I would use meters.
The meter.
Metres would probably be the most convenient.
Yes
21 feet
To measure the length of a hallway, you would typically use a measuring tool such as a tape measure or a measuring wheel. Start at one end of the hallway and extend the measuring tool to the other end, ensuring it is straight and taut for an accurate measurement. Record the measurement in the appropriate units, such as feet or meters, to determine the length of the hallway.
3 feet
The appropriate unit is a metre.
You would typically use a measuring tape or a ruler to measure the length of a school hallway in meters, centimeters, or millimeters. If you need to measure longer distances in kilometers, you might use a measuring wheel or a GPS device.
3 feet.
3 feet.
A rule doesn't exist !