It depends on which school desk. But mostly, it is measured in meters or centimeters.
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They are not. If I say that I have four pens on my desk, my measure of the number of pens on my desk is 4. Not 3.9, nor 4.1. Nor even 4.0000000000000000001 So the question is based on false premises.
Oh, dude, a school desk typically weighs around 50-70 pounds, depending on the materials used. But like, who really cares about the weight of a school desk, right? As long as it holds your textbooks and doesn't collapse under the weight of your procrastination, it's all good.
To measure a desk, you would typically use a tape measure or a ruler. Make sure to measure the length, width, and height of the desk for accurate dimensions. It's important to measure from the farthest points on each side to get the most precise measurements.
That depends how big the desk is.
The desk itself is not a polygon since it is a three-dimensional object, but a polygon is a two-dimensional object. Perhaps you are asking whether the top of the desk is shaped like a regular polygon. Most school desks have rounded corners (to reduce injuries) and thus would not be regular polygons. Some also have ridges and other irregularities for pencils and the like. And most are probably a little wider than they are long. But I'm sure there are some school desks somewhere whose tops are shaped like regular polygons. You'll have to examine the desks that your school uses and compare them to the definition of a regular polygon in your math book.