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).
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Calculate the volume of one sweet. Calculate the volume of the jar and then divide the volume of the jar by the volume of a sweet.
1) Calculate the area 2) Calculate the volume 3) Divide the area by the volume to get the ratio
Volume = pi*radius2*height
You measure or calculate the surface area; you measure or calculate the volume and then you divide the first by the second. The surface areas and volumes will, obviously, depend on the shape.
The answer is to do longxlargexheight