There is no standard size for a classroom - they vary from school to school, from city to city, and from one country to another.
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It is (W - 6) feet where W is the width measured in feet.
Length times width times depth ( L x W x D ) measures cubic feet and must be measured in feet.
It's not in the US. We measure carpet and used square FEET. When you sell a house, you quote the size of the rooms in Square FEET. Don't understand the question. The width of a room is measured in metres.
A measurement of 400 square feet is an area which is measured by multiplying the width by the length to reach a total of 400. An area 10 feet by 40 feet would be equal to a total of 400 square feet.
rooms are generally measured in 'square feet'. Take the length of the room multiplied by the width to get this measurement. materials used to cover walls and floors can be measured in square feet or square yards. to get square yards, divide the total square feet by 9.