The measure of the width of your classroom refers to the distance between the two parallel walls of the room. To determine this measurement accurately, you would need a tape measure or ruler. Simply place the measuring tool at one wall and extend it across to the opposite wall to get the width of the room.
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8 to 10 meters
in feet
For a rectangle, length X width = area. Measure the length in cm. Measure the width in cm. Multiply the length X the width to get the area in cm2.
There is no standard size for a classroom - they vary from school to school, from city to city, and from one country to another.
An approximate volume can be calculated by assuming the classroom is a cuboid (which it nearly is, except for windows, doorposts, etc) and measuring its length, its width and its height and multiplying the three lengths together. For a more accurate value, measure the largest cuboid that would fit in the room, calculate its volume and then add on the volume of every little nook and cranny of the classroom (by measuring them and calculating their volume).
Blackboards are different sizes. You need to measure the particular blackboard with a ruler or tape measure to get the width. The width is the shorter side (the length is the longer side).