It is any linear unit you want to use, depending on the magnitude of the width and on your particular requirements.
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METERS!!!The unit of measurement you would use to measure the width of your classroom is meters.
Units of length:femtometerangstrommillimetercentimetermeterkilometermil (thousandths of an inch)inchesfeetyardfathom
Inches or centimeters, depending on where you live.
Metric system: meters; customary system: feet
Measure the depth and width using the same units. Divide the depth measurement by the width measurement.